Run Detail

completedclaude-haiku-5.5

Unscored

Every model's answer from this round

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Provider

openrouter

Challenge Version

v2.0

Turns

Duration

280.4s

Total Tokens

67,223

Input Tokens

1,053

Output Tokens

66,170

Reasoning Tokens

50,854

Reasoning Effort

default

Est. Cost

$0.0332

Started

10/7/2026, 7:39:52 PM

OR Provider

Claude Platform on AWS

Finish Reason

stop

Generation ID

gen-1791401993-iWZaYGD0sMfwzRv7FD2M

Turns (1)

Turn #1

1,053 in66,170 out50,854 reasoning67,223 total280.4s

user

You make short animated pieces for the web, and you have spent time on the part of the internet that makes cats famous.

Build me a single HTML page: a cat in a living room that lifts off the floor and spins in the air when you click it.

The reference

Make this the Oiia Cat — the spinning cat meme, the one whose loop is written out as "oiia oiia oiiaiooooiai". Match the original's look and feel, not a generic rotation:

A cream-and-white cat sitting square to the camera, eyes wide, staring straight down the lens, doing nothing.
It starts turning on its vertical axis. The turn accelerates until the cat is a blur and the face is no longer readable.
The "oiia" vocal rides the spin. Rate and pitch climb together with it, so the sound is the spin.
In the edits this page is chasing, the cat leaves the floor. It rises as it winds up and spins in midair, and the room gets pulled into whatever the edit is doing.

Build toward what that meme feels like at full speed: too fast, too loud, and funnier every time it goes further.

The build

It opens quiet. The cat sitting in a real living room, doing nothing in particular. Push the realism as far as one file will take you — light that comes from somewhere in the room, depth behind the cat, fur that is not a flat shape, a floor that the cat is actually resting on. Someone arriving on this page should need a second to work out that it is not a photograph. That opening second is the whole joke and it only pays off if the room is convincing first.
Click the cat and it activates: it turns to face the viewer, lifts off the floor, and spins on its vertical axis in midair, fast, with the room going with it.
Every click after that escalates, and escalation here means crazier, not just faster. Four stages at least, each visibly and inventively past the one before — what the cat does, how high it goes, what happens to the room, what happens to the laws of physics, what else joins in. Stage four should be the one that makes someone send the page to a friend. It still has to be worth watching: a strobing white rectangle is not stage four.
It makes the sound. The "oiia" loop, synthesized in the file with Web Audio, rising as the spin gets faster. Making it read as a voice rather than as a tone is most of this requirement.
Sound starts on the click and never before, and I can mute it.

House rules

One file. Everything inline — no CDN, no external stylesheet, font, script or image. data: URIs are fine.
No libraries.
No network at runtime.
No localStorage, sessionStorage, cookies or indexedDB — sandboxed frame, they throw.
Return the file as exactly one fenced html block.

Answer in exactly these sections

The page

The single fenced html block.

The notes

Five bullets.

How the opening frame gets its realism, and where that realism gives out.
What you did to make it read as the Oiia cat rather than as a cat that rotates.
The four stages, in order, and what makes each one crazier than the last.
How the voice is synthesized, and what keeps it locked to the spin.
The part you would fix with more time.

assistant

The page

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Oiia Cat</title>
<style>
html,body{margin:0;height:100%;overflow:hidden;background:#0c0705}
canvas{position:fixed;left:0;top:0;width:100%;height:100%;display:block;cursor:pointer;touch-action:manipulation}
#mute{position:fixed;top:12px;right:12px;z-index:2;font:600 13px system-ui,sans-serif;color:#f3e6cf;background:rgba(20,12,6,.55);border:1px solid rgba(243,230,207,.35);border-radius:999px;padding:6px 12px;cursor:pointer}
#hint{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);font:500 14px system-ui,sans-serif;color:rgba(243,230,207,.6);letter-spacing:.05em;pointer-events:none;transition:opacity 1.2s}
</style>
</head>
<body>
<canvas id="c"></canvas>
<button id="mute">mute</button>
<div id="hint">click the cat</div>
<script>
(() => {
const cv = document.getElementById('c');
const g = cv.getContext('2d');
const muteBtn = document.getElementById('mute');
const hint = document.getElementById('hint');
const TAU = Math.PI * 2;
const HT = [0, .25, .42, .55, .6];                       // lift per stage, fraction of cat height
const NAMES = ['', 'warming up', 'lift-off', 'the room pulls', 'everything is spinning'];
const WORDS = ['oiia', 'oiia', 'OIIA', 'oiiaiooooiai', 'iooo'];
const VOW = [ {f:[520,820,2450]}, {f:[310,2250,3050]}, {f:[310,2250,3050]}, {f:[760,1250,2600]} ]; // o i i a
const VGAIN = [3.2, 1.6, 0.8], VQ = [7, 10, 12];

const S = {
  clicks:0, energy:0, tActive:0, angle:0, omega:0, lift:0,
  snap:0, snapTo:0, lastHalf:0, roll:0, shake:0, flash:0, pull:0,
  spinRoom:0, grav:1, kal:0, breath:0, t:0, trail:[], trailT:0, words:[], wordT:0
};

let W = 0, H = 0, DPR = 1, bg = null, catFront = null, catBack = null;
let catW = 0, catH = 0, floorY = 0, hz = 0, cx = 0;
const tmp = document.createElement('canvas'); tmp.width = 720; tmp.height = 880;
const tg = tmp.getContext('2d');

function rng(s) {
  return () => {
    s |= 0; s = s + 0x6D2B79F5 | 0;
    let t = Math.imul(s ^ s >>> 15, 1 | s);
    t = t + Math.imul(t ^ t >>> 7, 61 | t) ^ t;
    return ((t ^ t >>> 14) >>> 0) / 4294967296;
  };
}

/* ---------- cat sprite (prerendered, 720x880 = 2x of 360x440 logical) ---------- */
function fuzz(c, x0, y0, rx, ry, n, len, R) {
  c.lineCap = 'round';
  for (let i = 0; i < n; i++) {
    const t = R() * TAU, ca = Math.cos(t), sa = Math.sin(t);
    const nx = ca / rx, ny = sa / ry, nl = Math.hypot(nx, ny), ux = nx / nl, uy = ny / nl;
    const px = x0 + ca * rx, py = y0 + sa * ry, L = len * (0.4 + R() * 0.8);
    c.strokeStyle = R() < .5 ? '#fffaf0' : '#b99764';
    c.globalAlpha = 0.5 + R() * 0.45;
    c.lineWidth = 1 + R() * 0.6;
    c.beginPath();
    c.moveTo(px - ux, py - uy);
    c.quadraticCurveTo(px + ux * L * .5 + (R() - .5) * 3, py + uy * L * .5 + (R() - .5) * 3,
                       px + ux * L + (R() - .5) * 2, py + uy * L);
    c.stroke();
  }
  c.globalAlpha = 1;
}

function faceDetails(c) {
  c.lineCap = 'round';
  c.strokeStyle = 'rgba(150,110,70,.55)'; c.lineWidth = 3.2;
  for (const dx of [-12, 0, 12]) { c.beginPath(); c.moveTo(180 + dx * .6, 48 + Math.abs(dx) * .2); c.lineTo(180 + dx, 68); c.stroke(); }
  c.fillStyle = 'rgba(230,150,140,.22)';
  c.beginPath(); c.ellipse(120, 162, 17, 11, 0, 0, TAU); c.fill();
  c.beginPath(); c.ellipse(240, 162, 17, 11, 0, 0, TAU); c.fill();
  for (const ex of [142, 218]) {               // wide, open, staring eyes
    c.fillStyle = '#fffdf8'; c.beginPath(); c.ellipse(ex, 128, 26, 29, 0, 0, TAU); c.fill();
    c.strokeStyle = 'rgba(70,50,30,.7)'; c.lineWidth = 1.6; c.stroke();
    c.fillStyle = '#7a5530'; c.beginPath(); c.arc(ex, 130, 16, 0, TAU); c.fill();
    c.fillStyle = '#0b0705'; c.beginPath(); c.arc(ex, 130, 9, 0, TAU); c.fill();
    c.fillStyle = '#fff';
    c.beginPath(); c.arc(ex - 5, 122, 3.6, 0, TAU); c.fill();
    c.beginPath(); c.arc(ex + 6, 137, 1.6, 0, TAU); c.fill();
  }
  c.fillStyle = '#d98b86';
  c.beginPath(); c.moveTo(171, 155); c.lineTo(189, 155); c.lineTo(180, 166); c.closePath(); c.fill();
  c.strokeStyle = '#6b4a3a'; c.lineWidth = 1.6;
  c.beginPath(); c.moveTo(180, 166); c.quadraticCurveTo(174, 176, 166, 172);
  c.moveTo(180, 166); c.quadraticCurveTo(186, 176, 194, 172); c.stroke();
  c.strokeStyle = 'rgba(90,70,50,.55)'; c.lineWidth = .9;
  for (const s of [-1, 1]) for (const dy of [-6, 2, 10]) {
    c.beginPath();
    c.moveTo(180 + s * 46, 160 + dy * .3);
    c.quadraticCurveTo(180 + s * 78, 158 + dy * 1.2, 180 + s * 108, 150 + dy * 1.6);
    c.stroke();
  }
}

function backDetails(c) {
  c.strokeStyle = 'rgba(150,110,70,.35)'; c.lineWidth = 4; c.lineCap = 'round';
  for (let k = 0; k < 3; k++) { c.beginPath(); c.arc(180, 130, 36 + k * 14, -.4, .9 + k * .3); c.stroke(); }
}

function makeCat(faceOn) {
  const cvs = document.createElement('canvas'); cvs.width = 720; cvs.height = 880;
  const c = cvs.getContext('2d'); c.setTransform(2, 0, 0, 2, 0, 0);
  const R = rng(faceOn ? 11 : 23);
  c.lineCap = 'round'; c.lineJoin = 'round';
  // tail
  c.strokeStyle = '#d6bf93'; c.lineWidth = 30;
  c.beginPath(); c.moveTo(246, 404); c.bezierCurveTo(346, 432, 354, 328, 300, 298); c.stroke();
  // body
  let gr = c.createRadialGradient(140, 290, 30, 180, 330, 200);
  gr.addColorStop(0, '#fff6e4'); gr.addColorStop(.55, '#e4cfa8'); gr.addColorStop(1, '#9b7d56');
  c.fillStyle = gr; c.beginPath(); c.ellipse(180, 320, 98, 118, 0, 0, TAU); c.fill();
  c.save();
  c.beginPath(); c.ellipse(180, 320, 98, 118, 0, 0, TAU); c.clip();
  for (let i = 0; i < 520; i++) {
    const x = R() * 360, y = 200 + R() * 240;
    c.strokeStyle = R() < .5 ? '#fffaf0' : '#b89866';
    c.globalAlpha = .10 + R() * .12; c.lineWidth = 1;
    c.beginPath(); c.moveTo(x, y); c.lineTo(x + (R() - .5) * 5, y + 3 + R() * 5); c.stroke();
  }
  c.globalAlpha = 1;
  gr = c.createRadialGradient(180, 300, 4, 180, 300, 84);
  gr.addColorStop(0, '#fffdf6'); gr.addColorStop(1, 'rgba(255,253,246,0)');
  c.fillStyle = gr; c.beginPath(); c.ellipse(180, 300, 64, 100, 0, 0, TAU); c.fill();
  c.restore();
  fuzz(c, 180, 320, 98, 118, 240, 9, R);
  // paws
  c.fillStyle = '#f8efdc'; c.strokeStyle = 'rgba(120,90,55,.4)'; c.lineWidth = 1;
  for (const x of [146, 214]) { c.beginPath(); c.ellipse(x, 414, 28, 15, 0, 0, TAU); c.fill(); c.stroke(); }
  // ears
  c.fillStyle = '#e2cca0';
  c.beginPath(); c.moveTo(102, 88); c.lineTo(96, 14); c.lineTo(166, 64); c.closePath(); c.fill();
  c.beginPath(); c.moveTo(258, 88); c.lineTo(264, 14); c.lineTo(194, 64); c.closePath(); c.fill();
  c.fillStyle = '#efb8ae';
  c.beginPath(); c.moveTo(112, 80); c.lineTo(106, 32); c.lineTo(146, 66); c.closePath(); c.fill();
  c.beginPath(); c.moveTo(248, 80); c.lineTo(254, 32); c.lineTo(214, 66); c.closePath(); c.fill();
  // head
  gr = c.createRadialGradient(150, 96, 10, 180, 130, 100);
  gr.addColorStop(0, '#fffbf1'); gr.addColorStop(.6, '#eedcbb'); gr.addColorStop(1, '#a88a60');
  c.fillStyle = gr; c.beginPath(); c.ellipse(180, 130, 92, 80, 0, 0, TAU); c.fill();
  fuzz(c, 180, 130, 92, 80, 190, 7, R);
  if (faceOn) faceDetails(c); else backDetails(c);
  // key light from the window (left): lit left side, falloff to the right
  c.globalCompositeOperation = 'source-atop';
  gr = c.createLinearGradient(60, 0, 320, 0);
  gr.addColorStop(0, 'rgba(255,248,230,.2)'); gr.addColorStop(.55, 'rgba(0,0,0,0)'); gr.addColorStop(1, 'rgba(40,22,8,.3)');
  c.fillStyle = gr; c.fillRect(0, 0, 360, 440);
  c.globalCompositeOperation = 'source-over';
  return cvs;
}

/* ---------- room (prerendered) ---------- */
function buildBG() {
  bg = document.createElement('canvas');
  bg.width = Math.round(W * DPR); bg.height = Math.round(H * DPR);
  const b = bg.getContext('2d'); b.setTransform(DPR, 0, 0, DPR, 0, 0);
  const R = rng(42);
  // wall
  let gr = b.createLinearGradient(0, 0, 0, hz);
  gr.addColorStop(0, '#2f2620'); gr.addColorStop(.75, '#7a6350'); gr.addColorStop(1, '#6a5542');
  b.fillStyle = gr; b.fillRect(0, 0, W, hz + 2);
  for (let i = 0; i < 1600; i++) {
    b.fillStyle = R() < .5 ? 'rgba(255,230,190,.03)' : 'rgba(0,0,0,.04)';
    b.fillRect(R() * W, R() * hz, 2 + R() * 3, 2 + R() * 3);
  }
  // window with daylight
  const wx = W * .07, wy = H * .09, ww = W * .27, wh = hz - H * .16 - wy;
  gr = b.createLinearGradient(0, wy, 0, wy + wh);
  gr.addColorStop(0, '#fff3d8'); gr.addColorStop(1, '#cfe2e6');
  b.fillStyle = gr; b.fillRect(wx, wy, ww, wh);
  b.fillStyle = '#3a2c22';
  b.fillRect(wx - 12, wy - 12, ww + 24, 12); b.fillRect(wx - 12, wy + wh, ww + 24, 12);
  b.fillRect(wx - 12, wy, 12, wh); b.fillRect(wx + ww, wy, 12, wh);
  b.fillRect(wx + ww / 2 - 3, wy, 6, wh); b.fillRect(wx, wy + wh / 2 - 3, ww, 6);
  // window glow spilling onto the wall
  gr = b.createRadialGradient(wx + ww / 2, wy + wh / 2, 10, wx + ww / 2, wy + wh / 2, ww * 1.2);
  gr.addColorStop(0, 'rgba(255,230,180,.22)'); gr.addColorStop(1, 'rgba(255,230,180,0)');
  b.globalCompositeOperation = 'lighter'; b.fillStyle = gr; b.fillRect(0, 0, W, hz);
  b.globalCompositeOperation = 'source-over';
  // framed picture
  b.fillStyle = '#21180f'; b.fillRect(W * .4, H * .12, W * .11, H * .17);
  gr = b.createLinearGradient(0, H * .12, 0, H * .29);
  gr.addColorStop(0, '#9db3a3'); gr.addColorStop(1, '#5f7466');
  b.fillStyle = gr; b.fillRect(W * .4 + 7, H * .12 + 7, W * .11 - 14, H * .17 - 14);
  // sofa
  const sx = W * .6, sw = W * .34, top = hz - H * .13;
  b.fillStyle = '#3c2f40'; b.fillRect(sx, top, sw, H * .09);
  b.fillRect(sx - 10, top + H * .02, 16, H * .12);
  b.fillRect(sx + sw - 6, top + H * .02, 16, H * .12);
  b.fillStyle = '#5e4c63'; b.fillRect(sx + 8, top + H * .09, sw - 16, H * .05);
  b.fillStyle = '#4e3f54'; b.fillRect(sx + 10, top + H * .035, sw * .3, H * .05);
  b.fillRect(sx + sw * .55, top + H * .035, sw * .3, H * .05);
  // floor lamp (warm)
  const lx = W * .9, ly = hz - H * .27;
  b.strokeStyle = '#1d150f'; b.lineWidth = 5;
  b.beginPath(); b.moveTo(lx, hz + H * .03); b.lineTo(lx, ly + H * .05); b.stroke();
  b.fillStyle = '#1d150f'; b.beginPath(); b.ellipse(lx, hz + H * .03, W * .035, H * .012, 0, 0, TAU); b.fill();
  b.fillStyle = '#f0d8a6';
  b.beginPath(); b.moveTo(lx - W * .035, ly + H * .05); b.lineTo(lx + W * .035, ly + H * .05);
  b.lineTo(lx + W * .05, ly - H * .03); b.lineTo(lx - W * .05, ly - H * .03); b.closePath(); b.fill();
  gr = b.createRadialGradient(lx, ly, 10, lx, ly, W * .35);
  gr.addColorStop(0, 'rgba(255,190,110,.35)'); gr.addColorStop(1, 'rgba(255,190,110,0)');
  b.globalCompositeOperation = 'lighter'; b.fillStyle = gr; b.fillRect(0, 0, W, hz);
  b.globalCompositeOperation = 'source-over';
  // baseboard
  b.fillStyle = '#2e231b'; b.fillRect(0, hz - 8, W, 10);
  // floor
  gr = b.createLinearGradient(0, hz, 0, H);
  gr.addColorStop(0, '#6a4632'); gr.addColorStop(1, '#2a190f');
  b.fillStyle = gr; b.fillRect(0, hz + 2, W, H - hz);
  b.save(); b.beginPath(); b.rect(0, hz + 2, W, H - hz); b.clip();
  const vx = W * .5, vy = hz - H * .7;
  b.strokeStyle = 'rgba(15,8,4,.55)'; b.lineWidth = 1.3;
  for (let i = -16; i <= 24; i++) {
    const bx = W * .5 + i * W * .075;
    b.beginPath(); b.moveTo(vx, vy); b.lineTo(bx, H); b.stroke();
  }
  for (let k = 1; k <= 9; k++) {
    const y = hz + (H - hz) * Math.pow(k / 9, 1.7);
    b.beginPath(); b.moveTo(0, y); b.lineTo(W, y); b.stroke();
  }
  b.restore();
  // rug (flattened ellipse on the floor plane)
  b.save(); b.translate(W * .5, floorY + H * .02); b.scale(1, .3);
  gr = b.createRadialGradient(0, 0, 10, 0, 0, W * .3);
  gr.addColorStop(0, '#8c3b30'); gr.addColorStop(.8, '#5e2320'); gr.addColorStop(1, '#3a1714');
  b.fillStyle = gr; b.beginPath(); b.arc(0, 0, W * .3, 0, TAU); b.fill();
  b.strokeStyle = 'rgba(230,190,140,.35)'; b.lineWidth = 4;
  b.beginPath(); b.arc(0, 0, W * .27, 0, TAU); b.stroke();
  b.restore();
  // sunlight patch from the window across the floor
  b.save(); b.globalCompositeOperation = 'lighter';
  b.filter = 'blur(14px)';
  b.fillStyle = 'rgba(255,205,140,.16)';
  b.beginPath(); b.moveTo(wx, hz + 2); b.lineTo(wx + ww + 10, hz + 2);
  b.lineTo(W * .78, H); b.lineTo(W * .02, H); b.closePath(); b.fill();
  b.restore();
  // vignette
  gr = b.createRadialGradient(W / 2, H * .5, Math.min(W, H) * .3, W / 2, H * .5, Math.max(W, H) * .72);
  gr.addColorStop(0, 'rgba(0,0,0,0)'); gr.addColorStop(1, 'rgba(0,0,0,.7)');
  b.fillStyle = gr; b.fillRect(0, 0, W, H);
}

/* ---------- dust ---------- */
const dust = [];
{ const R0 = rng(5); for (let i = 0; i < 70; i++) dust.push({ x: R0(), y: R0(), s: R0(), ph: R0() * TAU }); }

/* ---------- drawing helpers ---------- */
function drawCatAt(x, yb, ang, sc, alpha, o) {
  const k = Math.max(0.02, Math.abs(Math.cos(ang)));
  const w = catW * sc, h = catH * sc;
  let src = Math.cos(ang) >= 0 ? catFront : catBack;
  if (o.shade) {
    tg.clearRect(0, 0, 720, 880);
    tg.globalCompositeOperation = 'source-over'; tg.drawImage(src, 0, 0);
    tg.globalCompositeOperation = 'source-atop';
    tg.fillStyle = `rgba(20,10,4,${(0.12 + 0.4 * (1 - k)).toFixed(3)})`;
    tg.fillRect(0, 0, 720, 880);
    tg.globalCompositeOperation = 'source-over';
    src = tmp;
  }
  g.save();
  g.globalAlpha = alpha;
  if (o.filt) g.filter = o.filt;
  g.translate(x, yb);
  g.rotate(o.tilt || 0);
  g.scale(k, 1 + (o.br || 0));
  g.drawImage(src, -w / 2, -h, w, h);
  g.restore();
}

function drawRoom(st) {
  g.save();
  g.translate(W / 2, H / 2); g.rotate(S.roll); g.translate(-W / 2, -H / 2);
  if (st < 3 || S.pull < .3) {
    g.drawImage(bg, 0, 0, W, H);
  } else if (st === 3) {
    // room pulled into a spinning tunnel: layered zoom and counter-rotation
    for (let k = 0; k < 4; k++) {
      const s = 1 + k * (0.08 + S.pull * 0.1);
      g.globalAlpha = k === 0 ? 1 : 0.28 * S.pull;
      g.save();
      g.translate(W / 2, H / 2); g.rotate(S.spinRoom * (k ? -1 : 0) + k * 0.05 * S.pull); g.scale(s, s);
      g.translate(-W / 2, -H / 2);
      g.drawImage(bg, 0, 0, W, H);
      g.restore();
    }
    g.globalAlpha = 1;
  } else {
    // stage 4: the room folds into six mirrored wedges, each one turning
    const N = 6, R2 = Math.hypot(W, H);
    for (let i = 0; i < N; i++) {
      const a0 = i * TAU / N, a1 = a0 + TAU / N + 0.02;
      g.save();
      g.beginPath(); g.moveTo(W / 2, H / 2);
      g.lineTo(W / 2 + Math.cos(a0) * R2, H / 2 + Math.sin(a0) * R2);
      g.lineTo(W / 2 + Math.cos(a1) * R2, H / 2 + Math.sin(a1) * R2);
      g.closePath(); g.clip();
      g.translate(W / 2, H / 2);
      if (i % 2) g.scale(-1, 1);
      g.rotate(S.spinRoom * (i % 2 ? -1.6 : 1));
      g.translate(-W / 2, -H / 2);
      g.drawImage(bg, 0, 0, W, H);
      g.restore();
    }
  }
  g.restore();
}

/* ---------- physics & state ---------- */
function update(dt) {
  S.t += dt;
  const st = Math.min(S.clicks, 4);
  const active = S.energy > 0;

  if (S.snap > 0) {                       // turn to face the viewer first
    S.snap -= dt;
    S.angle += (S.snapTo - S.angle) * Math.min(1, dt * 9);
    S.omega = 0;
  } else if (active) {                    // accelerate until the face is unreadable
    S.energy -= dt; S.tActive += dt;
    const tgt = Math.min(70, 3 + S.tActive * S.tActive * (4 + S.clicks * 1.5) + S.tActive * S.clicks * 2);
    S.omega += (tgt - S.omega) * (1 - Math.exp(-dt * 1.5));
  } else {
    S.omega *= Math.exp(-dt * 1.1);
  }
  S.angle += S.omega * dt;

  const lifting = active || S.snap > 0;
  const ht = lifting ? HT[st] * catH : 0;
  S.lift += (ht - S.lift) * (1 - Math.exp(-dt * (lifting ? 2.4 : 1.6)));

  S.shake *= Math.exp(-dt * 5);
  S.flash *= Math.exp(-dt * 3.2);
  S.kal += ((st >= 4 && active ? 1 : 0) - S.kal) * (1 - Math.exp(-dt * 3));
  S.pull += ((st >= 3 && active ? 1 : 0) - S.pull) * (1 - Math.exp(-dt * 2));
  S.grav += ((st >= 3 && active ? -1 : 1) - S.grav) * (1 - Math.exp(-dt * 2));
  S.roll = st >= 2 ? Math.sin(S.t * 1.7) * 0.03 * (st - 1) * (active ? 1 : .3) : 0;
  S.spinRoom += dt * Math.min(S.omega, 40) * 0.004 * (0.2 + S.pull);
  S.breath = Math.sin(S.t * 2.1);

  for (const p of dust) {
    p.y += dt * S.grav * (0.012 + p.s * 0.03);
    if (p.y < 0) p.y += 1; if (p.y > 1) p.y -= 1;
    p.x += Math.sin(S.t * 0.7 + p.ph) * dt * 0.003;
    if (p.x < 0) p.x += 1; if (p.x > 1) p.x -= 1;
  }

  if (st >= 2 && active && S.omega > 8) {
    S.trailT -= dt;
    if (S.trailT <= 0) {
      S.trailT = 0.03;
      S.trail.push({ a: S.angle, l: S.lift });
      if (S.trail.length > 7) S.trail.shift();
    }
  } else if (S.trail.length) S.trail.shift();

  if (st >= 4 && active && S.t - S.wordT > 0.28) {
    S.wordT = S.t;
    S.words.push({ x: W * (0.12 + Math.random() * 0.76), y: H * (0.12 + Math.random() * 0.7),
      t0: S.t, txt: WORDS[Math.random() * WORDS.length | 0], r: (Math.random() - .5) * 0.5 });
  }
  S.words = S.words.filter(w => S.t - w.t0 < 0.9);

  if (ac) {
    droneOsc.frequency.setTargetAtTime(55 + S.omega * 0.5, ac.currentTime, 0.2);
    droneG.gain.setTargetAtTime(Math.min(0.12, S.omega / 500), ac.currentTime, 0.2);
  }
  // the voice is driven by the spin: one syllable per half turn
  const half = Math.floor(S.angle / Math.PI);
  if (ac && half > S.lastHalf) {
    S.lastHalf = half;
    if (S.omega > 1.5) syl(half, S.omega, st);
  }
}

/* ---------- render ---------- */
function render() {
  const st = Math.min(S.clicks, 4);
  g.setTransform(DPR, 0, 0, DPR, 0, 0);
  g.fillStyle = '#0c0705'; g.fillRect(0, 0, W, H);
  g.save();
  g.translate((Math.random() - .5) * S.shake, (Math.random() - .5) * S.shake);

  drawRoom(st);

  // contact shadow, which lifts away as the cat rises
  const sa = Math.max(0, .55 - S.lift / catH * .5);
  const rs = catW * .62 * (1 + S.lift / catH * .2);
  g.save(); g.translate(cx, floorY); g.scale(1, .12);
  const sg = g.createRadialGradient(0, 0, 0, 0, 0, rs);
  sg.addColorStop(0, `rgba(0,0,0,${sa})`); sg.addColorStop(1, 'rgba(0,0,0,0)');
  g.fillStyle = sg; g.beginPath(); g.arc(0, 0, rs, 0, TAU); g.fill();
  g.restore();

  // stage 4: orbiting copies, hue-shifted and depth-sorted
  if (S.kal > .02) {
    const n = Math.min(14, 6 + Math.max(0, S.clicks - 4) * 2);
    const list = [];
    for (let i = 0; i < n; i++) {
      const ph = i * TAU / n + S.angle * .12;
      const z = Math.sin(ph), sc = .32 + .1 * (z + 1);
      list.push({ x: cx + Math.cos(ph) * W * .36, y: H * .46 + z * H * .2 + catH * sc * .5, sc, z, i, ph });
    }
    list.sort((a, b) => a.z - b.z);
    for (const p of list) {
      drawCatAt(p.x, p.y, S.angle * (1 + (p.i % 3) * .35) + p.i * .7, p.sc, .9 * S.kal, {
        filt: `hue-rotate(${Math.round((S.t * 120 + p.i * 47) % 360)}deg) saturate(1.5)`,
        tilt: Math.sin(p.ph * 2) * .25
      });
    }
  }

  // afterimages
  const L = S.trail.length;
  for (let i = 0; i < L; i++) {
    const p = S.trail[i];
    drawCatAt(cx + Math.sin(p.a) * catW * .06, floorY - p.l, p.a, 1, .05 + .09 * (i + 1) / L, {});
  }

  // the cat
  const idle = S.energy <= 0 && S.snap <= 0;
  drawCatAt(cx, floorY - S.lift, S.angle, 1, 1, {
    shade: true,
    tilt: st >= 2 ? Math.sin(S.t * 2.3) * .05 * st * (S.omega > 10 ? 1 : .3) : 0,
    br: idle ? S.breath * .005 : 0
  });

  // dust
  g.fillStyle = 'rgba(255,236,200,1)';
  for (const p of dust) {
    g.globalAlpha = .25 + .5 * p.s;
    g.beginPath(); g.arc(p.x * W, p.y * H, .6 + p.s * 1.6, 0, TAU); g.fill();
  }
  g.globalAlpha = 1;

  // "oiia" words in stage 4
  for (const w of S.words) {
    const age = (S.t - w.t0) / .9;
    g.save();
    g.globalAlpha = (1 - age) * .85;
    g.translate(w.x, w.y); g.rotate(w.r);
    g.font = `900 ${Math.round(catH * (.2 + .1 * Math.sin(age * Math.PI)))}px "Arial Black",Impact,sans-serif`;
    g.textAlign = 'center'; g.lineWidth = 6; g.strokeStyle = '#120a05';
    g.strokeText(w.txt, 0, 0);
    g.fillStyle = '#ffe9b8'; g.fillText(w.txt, 0, 0);
    g.restore();
  }

  // flash on the bigger clicks
  if (S.flash > .01) { g.fillStyle = `rgba(255,240,215,${(S.flash * .22).toFixed(3)})`; g.fillRect(0, 0, W, H); }
  g.restore();

  if (S.clicks > 0) {
    const rpm = Math.round(S.omega * 9.549 * (1 + .5 * S.clicks));
    g.font = '600 13px ui-monospace,Menlo,monospace';
    g.fillStyle = 'rgba(243,230,207,.82)';
    g.fillText(`clicks ${S.clicks}   stage ${st}  ${NAMES[st]}`, 16, 28);
    g.fillText(`spin ${rpm.toLocaleString()} rpm`, 16, 48);
  }
}

/* ---------- sound ---------- */
let ac = null, master, voiceBus, shaper, droneOsc, droneG, noiseBuf;
let prevF = VOW[0].f, muted = false;

function setDrive(clicks) {
  if (!shaper) return;
  const amt = Math.min(14, 1.5 * clicks);
  const n = 2048, c = new Float32Array(n);
  for (let i = 0; i < n; i++) { const x = i / (n - 1) * 2 - 1; c[i] = Math.tanh(x * (1 + amt)) / Math.tanh(1 + amt); }
  shaper.curve = c;
}

function ensureAudio() {
  if (ac) { if (ac.state === 'suspended') ac.resume(); return; }
  const AC = window.AudioContext || window.webkitAudioContext;
  if (!AC) return;
  ac = new AC();
  master = ac.createGain(); master.gain.value = muted ? 0 : .85; master.connect(ac.destination);
  const comp = ac.createDynamicsCompressor(); comp.threshold.value = -18; comp.ratio.value = 6; comp.connect(master);
  shaper = ac.createWaveShaper(); shaper.oversample = '2x'; shaper.connect(comp);
  voiceBus = ac.createGain(); voiceBus.gain.value = .5; voiceBus.connect(shaper);
  droneOsc = ac.createOscillator(); droneOsc.type = 'sine'; droneOsc.frequency.value = 55;
  droneG = ac.createGain(); droneG.gain.value = 0;
  droneOsc.connect(droneG); droneG.connect(master); droneOsc.start();
  noiseBuf = ac.createBuffer(1, ac.sampleRate, ac.sampleRate);
  const d = noiseBuf.getChannelData(0);
  for (let i = 0; i < d.length; i++) d[i] = Math.random() * 2 - 1;
  setDrive(0);
}

// one "oi"/"ia" syllable: glottal-ish sawtooth through three formant bandpasses,
// formants glide from the previous vowel to this one, pitch follows spin speed
function syl(idx, w, st) {
  const t = ac.currentTime;
  const dur = Math.max(.035, Math.min(.26, Math.PI / w * .85));
  const v = VOW[idx & 3].f;
  const f0 = Math.min(640, 140 + 3.6 * w + st * 12) * (1 + (Math.random() - .5) * .01);
  const env = ac.createGain();
  env.gain.setValueAtTime(.0001, t);
  env.gain.exponentialRampToValueAtTime(.4, t + Math.min(.012, dur * .25));
  env.gain.setValueAtTime(.4, t + dur * .6);
  env.gain.exponentialRampToValueAtTime(.0001, t + dur);

  const o = ac.createOscillator(); o.type = 'sawtooth';
  o.frequency.setValueAtTime(f0 * .94, t);
  o.frequency.linearRampToValueAtTime(f0 * 1.03, t + dur);
  const lfo = ac.createOscillator(); lfo.frequency.value = 5.5 + Math.random() * 2;
  const lg = ac.createGain(); lg.gain.value = f0 * .02;
  lfo.connect(lg); lg.connect(o.frequency);
  o.connect(env);
  lfo.start(t); lfo.stop(t + dur + .03);

  if (st >= 3) { // choir octave joins in
    const o2 = ac.createOscillator(); o2.type = 'triangle';
    o2.frequency.setValueAtTime(f0 * 2 * .94, t);
    o2.frequency.linearRampToValueAtTime(f0 * 2 * 1.03, t + dur);
    const g2 = ac.createGain(); g2.gain.value = .5;
    o2.connect(g2); g2.connect(env);
    o2.start(t); o2.stop(t + dur + .03);
  }

  const out = ac.createGain(); out.connect(voiceBus);
  for (let i = 0; i < 3; i++) {
    const f = ac.createBiquadFilter(); f.type = 'bandpass'; f.Q.value = VQ[i];
    f.frequency.setValueAtTime(prevF[i], t);
    f.frequency.linearRampToValueAtTime(v[i], t + dur * .7);
    const fg = ac.createGain(); fg.gain.value = VGAIN[i];
    env.connect(f); f.connect(fg); fg.connect(out);
  }
  prevF = v;
  o.start(t); o.stop(t + dur + .03);
}

function whoosh() {
  if (!ac) return;
  const t = ac.currentTime;
  const s = ac.createBufferSource(); s.buffer = noiseBuf;
  const f = ac.createBiquadFilter(); f.type = 'bandpass'; f.Q.value = 2;
  f.frequency.setValueAtTime(300, t); f.frequency.exponentialRampToValueAtTime(3000, t + .9);
  const gg = ac.createGain();
  gg.gain.setValueAtTime(.0001, t);
  gg.gain.exponentialRampToValueAtTime(.5, t + .3);
  gg.gain.exponentialRampToValueAtTime(.0001, t + 1);
  s.connect(f); f.connect(gg); gg.connect(voiceBus);
  s.start(t); s.stop(t + 1.05);
}

function setMute(m) {
  muted = m;
  muteBtn.textContent = m ? 'unmute' : 'mute';
  if (master) master.gain.setTargetAtTime(m ? 0 : .85, ac.currentTime, .03);
}
muteBtn.addEventListener('click', e => { e.stopPropagation(); setMute(!muted); });
window.addEventListener('keydown', e => { if (e.key === 'm' || e.key === 'M') setMute(!muted); });

/* ---------- interaction ---------- */
function activate() {
  ensureAudio();
  const wasIdle = S.energy <= 0 && S.snap <= 0;
  S.clicks++;
  if (wasIdle) { S.snapTo = Math.round(S.angle / TAU) * TAU; S.snap = .35; S.tActive = 0; }
  S.energy = Math.min(16, S.energy + 2.5 + S.clicks * 1.1);
  S.shake = 3 + Math.min(5, S.clicks) * 3;
  S.flash = 1;
  setDrive(S.clicks);
  if (S.clicks >= 2) whoosh();
  hint.style.opacity = 0;
}

cv.addEventListener('pointerdown', e => {
  const cy = floorY - S.lift - catH * .5;
  const dx = (e.clientX - cx) / (catW * .6), dy = (e.clientY - cy) / (catH * .58);
  if (dx * dx + dy * dy > 1) return;
  activate();
});

/* ---------- setup & loop ---------- */
function resize() {
  DPR = Math.min(2, window.devicePixelRatio || 1);
  W = window.innerWidth; H = window.innerHeight;
  cv.width = Math.round(W * DPR); cv.height = Math.round(H * DPR);
  hz = H * .6;
  catH = Math.min(H * .5, W * .5); catW = catH * 360 / 440;
  floorY = H * .84; cx = W * .5;
  buildBG();
}

catFront = makeCat(true);
catBack = makeCat(false);
resize();
window.addEventListener('resize', resize);

let last = performance.now();
function loop(now) {
  const dt = Math.min(1 / 30, (now - last) / 1000);
  last = now;
  update(dt);
  render();
  requestAnimationFrame(loop);
}
requestAnimationFrame(loop);
})();
</script>
</body>
</html>

The notes

The opening frame: The room is prerendered once. It has a window on the left with a light spill onto the wall, a sunlit floor patch that falls toward the cat, perspective floorboards, a rug on the floor plane, a warm lamp, a sofa, a framed picture and a vignette. The cat has a key light from the window, body fuzz, and a contact shadow on the rug. Idle breathing and drifting dust keep it alive. It stops being convincing at the edges: the fur is a stroke-based drawing, the lighting is a single gradient, and the eyes are cartoon-clean. A careful viewer will see the illustration in about two seconds.
Reading as the Oiia cat: The eyes are wide and centered, and the cat sits square to the lens and stares. The spin is a horizontal squash of the front sprite, which switches to a back sprite at the midpoint, so the turn reads as a real rotation. Spin-side shading darkens the body as it turns edge-on. The meme's signature is the blur, so the angular speed ramps quadratically until the face stops resolving. Afterimages and motion-matched tilt make the blur feel physical.
The four stages: (1) Turns to face the viewer, lifts a quarter of its height and spins up to blur, with the room only shaking. (2) Lifts higher, leaves afterimages, and the room rolls like a badly held camera, with a rising RPM readout. (3) The room is pulled into a spinning zoom tunnel, the dust reverses gravity, and a flash fires on each click. (4) The room folds into six mirrored wedges, six to fourteen copies of the cat orbit in shifting hues, "oiia" words burst on screen, and a choir octave joins the voice. Each further click adds copies, drive and speed.
The voice: Each half turn of the cat triggers one syllable, cycling o–i–i–a, so the rhythm is the spin itself and the sound stops when the spin stops. The syllable is a sawtooth through three bandpass formant filters, and the formants glide from the previous vowel. Pitch and syllable length are both functions of angular velocity, so rate and pitch rise together. A light vibrato, a waveshaper whose drive grows with clicks, and a compressor keep it sounding like a throat rather than a tone. Audio is created only inside the first click handler, and mute is a button or the M key.
With more time: I would replace the stroke fur with a real per-hair shader, since the silhouette is the most visible giveaway. I would add a proper voice model with a breath-noise stage and consonant onsets so it reads less as a synth vowel. I would also move the room rendering to WebGL so that the stage 3 and 4 distortions can run per-pixel instead of as stacked transforms.

Attachments

anthropic/claude-haiku-5.5 — page