Run Detail
completedgpt-6-sol-proRecorded for these videos
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Provider
openrouter
Challenge Version
v2.0
Turns
1
Duration
Batched — not timed
Total Tokens
42,906
Input Tokens
22,978
Output Tokens
19,928
Reasoning Tokens
3,157
Reasoning Effort
default
Est. Cost
$0.1226
Started
9/22/2026, 9:44:55 PM
OR Provider
OpenAI
Finish Reason
stop
Generation ID
gen-batch-1790113496-888e949812af9af51672
Turns (1)
Turn #1
22,978 in19,928 out3,157 reasoning42,906 total
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 orindexedDB— sandboxed frame, they throw. - Return the file as exactly one fenced
htmlblock.
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, in the living room</title>
<style>
* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { background: #342e2b; font-family: system-ui, sans-serif; }
canvas { display: block; width: 100%; height: 100%; cursor: pointer; }
.ui {
position: fixed; inset: 0; pointer-events: none;
color: #fff8ee; text-shadow: 0 2px 12px #241912bb;
}
.hint {
position: absolute; left: 50%; bottom: 5%;
transform: translateX(-50%); white-space: nowrap;
padding: 9px 15px; border-radius: 30px;
background: #332d298a; backdrop-filter: blur(8px);
font-size: 13px; letter-spacing: .035em;
transition: opacity .5s;
}
.hint.hidden { opacity: 0; }
.label {
position: absolute; top: 22px; left: 25px;
font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
opacity: .65;
}
button {
pointer-events: auto; position: absolute; top: 17px; right: 18px;
color: #fff8ee; background: #332d2999;
border: 1px solid #ffffff55; border-radius: 30px;
padding: 9px 13px; cursor: pointer; font: inherit; font-size: 12px;
backdrop-filter: blur(8px);
}
button:hover { background: #51423bcc; }
</style>
</head>
<body>
<canvas id="scene" aria-label="A cream-and-white cat sitting in a living room. Click the cat to make it spin."></canvas>
<div class="ui">
<div class="label">A perfectly ordinary afternoon</div>
<div class="hint" id="hint">click the cat</div>
<button id="mute" type="button" aria-label="Mute sound">Sound on</button>
</div>
<script>
(() => {
'use strict';
const canvas = document.querySelector('#scene');
const ctx = canvas.getContext('2d', { alpha: false });
const hint = document.querySelector('#hint');
const muteButton = document.querySelector('#mute');
const W = 1100, H = 740, TAU = Math.PI * 2;
let cw, ch, dpr, fit, ox, oy;
let stage = 0, extra = 0, muted = false, angle = 0, speed = 0;
let lift = 0, clickTime = 0, last = performance.now(), time = 0;
let audio, voice, voice2, volume, filter;
function rng(seed) {
return () => {
seed = (Math.imul(seed, 1664525) + 1013904223) | 0;
return (seed >>> 0) / 4294967296;
};
}
const random = rng(90317);
const lerp = (a,b,t) => a+(b-a)*t;
const clamp = (x,a,b) => Math.max(a,Math.min(b,x));
const ease = x => x*x*(3-2*x);
function ellipse(c,x,y,rx,ry,color) {
c.beginPath(); c.ellipse(x,y,rx,ry,0,0,TAU);
if (color) { c.fillStyle=color; c.fill(); }
}
function line(c,x1,y1,x2,y2,color,width=1) {
c.strokeStyle=color; c.lineWidth=width;
c.beginPath(); c.moveTo(x1,y1); c.lineTo(x2,y2); c.stroke();
}
function grad(c,x,y,r,stops) {
const g=c.createRadialGradient(x,y,1,x,y,r);
stops.forEach(([at,col])=>g.addColorStop(at,col));
return g;
}
// The still room is painted once, including its fine-grained surfaces.
const room=document.createElement('canvas');
room.width=W; room.height=H;
const r=room.getContext('2d');
function drawRoom() {
let g=r.createLinearGradient(0,0,W,H);
g.addColorStop(0,'#b9b4a8'); g.addColorStop(.48,'#d4cabe');
g.addColorStop(1,'#a99b8d');
r.fillStyle=g; r.fillRect(0,0,W,H);
// Recessed window, late-afternoon light from camera left.
r.fillStyle='#a69b8d'; r.fillRect(48,65,319,326);
r.fillStyle='#ede8df'; r.fillRect(55,70,303,313);
g=r.createLinearGradient(80,77,310,362);
g.addColorStop(0,'#d7e7e4'); g.addColorStop(.65,'#b8c9c2');
g.addColorStop(1,'#e7d5ae');
r.fillStyle=g; r.fillRect(72,86,267,281);
r.fillStyle='#87938a';
r.beginPath(); r.moveTo(72,323); r.lineTo(151,248); r.lineTo(210,304);
r.lineTo(269,234); r.lineTo(339,302); r.lineTo(339,367);
r.lineTo(72,367); r.fill();
r.fillStyle='#aab3a2';
r.beginPath(); r.moveTo(72,343); r.lineTo(158,294); r.lineTo(222,339);
r.lineTo(295,281); r.lineTo(339,324); r.lineTo(339,367);
r.lineTo(72,367); r.fill();
r.fillStyle='#f4eee1';
r.fillRect(66,80,9,296); r.fillRect(202,80,9,296);
r.fillRect(333,80,10,296); r.fillRect(66,219,276,9);
g=r.createLinearGradient(52,0,168,0);
g.addColorStop(0,'#c9bdae'); g.addColorStop(.7,'#eee5d6');
g.addColorStop(1,'#d6cabb');
r.fillStyle=g;
r.beginPath(); r.moveTo(44,65); r.bezierCurveTo(98,93,96,323,38,406);
r.lineTo(113,403); r.bezierCurveTo(153,257,115,119,93,65);
r.fill();
r.beginPath(); r.moveTo(361,65); r.bezierCurveTo(324,126,332,319,374,404);
r.lineTo(330,400); r.bezierCurveTo(293,254,326,109,308,65); r.fill();
// Wall molding, art, and the soft spill of the window.
r.fillStyle='#ded3c3'; r.fillRect(0,409,W,9);
r.fillStyle='#9e8b77'; r.fillRect(0,418,W,4);
r.fillStyle='#dfd5c8'; r.fillRect(0,422,W,20);
r.fillStyle='#786d5f'; r.fillRect(690,112,180,141);
r.fillStyle='#ede7d9'; r.fillRect(698,120,164,125);
r.fillStyle='#adac98'; r.fillRect(710,132,140,101);
r.fillStyle='#697a70';
r.beginPath(); r.ellipse(790,185,51,27,-.5,0,TAU); r.fill();
r.fillStyle='#d8c3a4';
r.beginPath(); r.ellipse(789,184,28,43,.55,0,TAU); r.fill();
// Perspective floorboards.
g=r.createLinearGradient(0,440,0,H);
g.addColorStop(0,'#9a7860'); g.addColorStop(.5,'#b28c6e');
g.addColorStop(1,'#70543f');
r.fillStyle=g; r.fillRect(0,442,W,H-442);
for(let i=-8;i<=13;i++) {
line(r,550+(i-5)*43,442,550+(i-5)*136,H,'#563d30a0',1.3);
line(r,550+(i-5)*43+3,442,550+(i-5)*136+5,H,'#ead0a045',1);
}
for(const y of [486,553,655]) {
line(r,0,y,W,y,'#604a3880',2);
line(r,0,y+3,W,y+3,'#e6c59735',1);
}
// Rug: its back edge is tucked behind the cat.
r.save(); r.translate(531,622); r.scale(1,.29);
ellipse(r,0,0,391,295,'#b1a59a');
ellipse(r,0,0,371,277,'#e0d2bb');
ellipse(r,0,0,349,256,'#b9a898');
ellipse(r,0,0,337,245,'#d6c5ad');
r.restore();
// Sofa, with separated cushions and contact shadows.
r.fillStyle='#473d36aa';
ellipse(r,926,520,197,39);
g=r.createLinearGradient(0,277,0,530);
g.addColorStop(0,'#927b68'); g.addColorStop(.5,'#746354');
g.addColorStop(1,'#53483d');
r.fillStyle=g;
r.beginPath(); r.roundRect(769,277,351,231,34); r.fill();
r.fillStyle='#a28b74';
r.beginPath(); r.roundRect(783,295,145,145,20); r.fill();
r.fillStyle='#ae957e';
r.beginPath(); r.roundRect(934,295,171,145,20); r.fill();
r.fillStyle='#69594d';
r.beginPath(); r.roundRect(775,430,347,79,19); r.fill();
r.fillStyle='#8f7865';
r.beginPath(); r.roundRect(785,436,155,60,14); r.fill();
r.beginPath(); r.roundRect(946,436,165,60,14); r.fill();
r.fillStyle='#453c34';
r.fillRect(797,495,14,42); r.fillRect(1076,495,14,42);
r.fillStyle='#bc997c';
r.beginPath(); r.roundRect(1007,368,70,75,9); r.fill();
for(let i=0;i<50;i++){
const x=783+random()*330,y=287+random()*214;
line(r,x,y,x+random()*13,y+2,'#f4dfb112',1);
}
// Lamp and plant supply small, recognizable room-scale details.
r.fillStyle='#4b4238'; r.fillRect(721,339,8,147);
r.fillStyle='#52473b'; ellipse(r,725,490,41,9);
r.fillStyle='#e4d2b6';
r.beginPath(); r.moveTo(688,312); r.lineTo(763,312);
r.lineTo(745,374); r.lineTo(705,374); r.closePath(); r.fill();
r.fillStyle='#51483e'; r.fillRect(690,310,71,4);
r.fillStyle='#b89470';
r.beginPath(); r.moveTo(43,492); r.lineTo(113,492);
r.lineTo(104,563); r.lineTo(58,563); r.closePath(); r.fill();
for(let i=0;i<14;i++){
const a=i*2.399, length=37+random()*46;
r.save(); r.translate(80,491); r.rotate(a);
r.fillStyle=i%3?'#4d6851':'#688165';
r.beginPath(); r.ellipse(0,-length/2,10,length/2,0,0,TAU);
r.fill(); r.restore();
}
// Grain, uneven light, and a restrained photographic vignette.
for(let i=0;i<19500;i++){
const x=random()*W,y=random()*H;
r.fillStyle=random()<.5?'#ffffff0c':'#261b150c';
r.fillRect(x,y,1+random()*2,1+random()*2);
}
r.fillStyle=grad(r,165,210,1050,[
[0,'#fff6d300'],[.55,'#fff6d306'],[1,'#261b1b75']
]);
r.fillRect(0,0,W,H);
r.fillStyle=grad(r,117,147,390,[
[0,'#fff6d244'],[1,'#fff6d200']
]);
r.fillRect(0,0,550,590);
}
drawRoom();
function makeCat(back=false) {
const cv=document.createElement('canvas'); cv.width=520; cv.height=640;
const c=cv.getContext('2d'), q=rng(back?8721:2934);
c.lineCap='round';
// Tail peeks out along the floor.
c.strokeStyle='#805e45'; c.lineWidth=61;
c.beginPath(); c.moveTo(336,527); c.bezierCurveTo(408,563,431,532,430,481); c.stroke();
c.strokeStyle='#c79a71'; c.lineWidth=47; c.stroke();
for(let i=0;i<12;i++){
let x=352+i*6;
line(c,x,537-i*.8,x+11,547-i*1.8,'#9e715171',4);
}
// Seated, rather than standing: broad haunches, a narrow neck.
const bodyPath=()=>{
c.beginPath();
c.moveTo(260,288);
c.bezierCurveTo(192,282,143,327,119,423);
c.bezierCurveTo(92,538,144,574,260,574);
c.bezierCurveTo(376,574,428,538,401,423);
c.bezierCurveTo(377,327,328,282,260,288);
c.closePath();
};
bodyPath();
c.fillStyle=grad(c,223,367,231,[
[0,'#f4dec0'],[.53,'#dfb98f'],[.83,'#b78a68'],[1,'#715641']
]); c.fill();
c.save(); bodyPath(); c.clip();
ellipse(c,255,465,89,130,grad(c,233,430,157,[
[0,'#fffaf0'],[.7,'#efe8d8'],[1,'#cbbca9']
]));
if(back) {
c.fillStyle='#bc875f';
for(let i=0;i<7;i++){
c.beginPath(); c.ellipse(259,322+i*34,82-i*3,8,0,0,TAU); c.fill();
}
}
// Directional individual hairs catch the window light.
for(let i=0;i<4400;i++){
const x=106+q()*308,y=293+q()*286;
const a=(x-260)/210;
c.strokeStyle=q()<.55?'#fff3d047':'#785b4530';
c.lineWidth=.35+q()*1.4;
line(c,x,y,x+a*2+(q()-.5)*3,y+3+q()*12,c.strokeStyle,c.lineWidth);
}
c.restore();
// White paws have their own weight and small toe divisions.
for(const x of [197,323]){
ellipse(c,x,549,51,54,grad(c,x-12,526,74,[
[0,'#fffdf4'],[.7,'#e9e4d8'],[1,'#a89e90']
]));
ellipse(c,x,574,48,22,'#f2eee3');
for(let t=-1;t<=1;t++)
line(c,x+t*19,566,x+t*19-3,583,'#a89e9080',1.4);
}
// Ears are behind the face; inner ear skin shows through fine fur.
function ear(x,flip) {
c.save(); c.translate(x,131); c.scale(flip,1);
c.beginPath(); c.moveTo(-56,30); c.quadraticCurveTo(-51,-49,-34,-89);
c.quadraticCurveTo(-21,-100,32,-27); c.lineTo(54,33); c.closePath();
c.fillStyle='#c7956d'; c.fill();
c.beginPath(); c.moveTo(-38,10); c.lineTo(-29,-67);
c.quadraticCurveTo(-24,-70,21,-11); c.closePath();
c.fillStyle=grad(c,-13,-12,67,[
[0,'#bd7772'],[.6,'#dcaaa0'],[1,'#ecd0bc']
]); c.fill();
for(let i=0;i<150;i++){
let px=-35+q()*70,py=-49+q()*87;
line(c,px,py,px+(q()-.5)*11,py+q()*14,
q()<.55?'#ffe9ce76':'#78564538',.5+q());
}
c.restore();
}
ear(177,1); ear(343,-1);
const headPath=()=>{
c.beginPath();
c.moveTo(259,109);
c.bezierCurveTo(172,103,118,160,132,250);
c.bezierCurveTo(140,303,194,337,260,338);
c.bezierCurveTo(326,337,380,303,388,250);
c.bezierCurveTo(402,160,347,103,259,109);
c.closePath();
};
headPath();
c.fillStyle=grad(c,223,171,196,[
[0,'#f5e4c6'],[.5,'#e9c5a0'],[.78,'#ca9d77'],[1,'#765842']
]); c.fill();
c.save(); headPath(); c.clip();
// Ginger crown and asymmetrical markings over a creamy face.
ellipse(c,258,120,110,68,'#c58e64');
ellipse(c,168,209,39,91,'#ca966e');
ellipse(c,352,204,39,89,'#d2a078');
if(back) {
for(let i=0;i<8;i++){
line(c,173+i*25,120,186+i*20,292,
i%2?'#a6775670':'#f9dbaf50',8);
}
} else {
ellipse(c,262,281,91,65,grad(c,242,262,99,[
[0,'#fffdf5'],[.75,'#f2ecde'],[1,'#d5c4ac']
]));
for(let i=0;i<4;i++){
let x=211+i*32;
c.strokeStyle='#a8714b5a'; c.lineWidth=7-i*.8;
c.beginPath(); c.moveTo(x,133); c.quadraticCurveTo(x+8,154,x+3,170);
c.stroke();
}
for(const side of [-1,1]){
for(let i=0;i<2;i++){
line(c,260+side*81,181+i*19,
260+side*(111-i*5),174+i*22,'#9d694b66',6);
}
}
}
for(let i=0;i<6100;i++){
let x=130+q()*260,y=105+q()*235;
let dir=(x-260)*.025;
line(c,x,y,x+dir+(q()-.5)*4,y+2+q()*9,
q()<.55?'#fff2d452':'#76533c31',.35+q()*1.15);
}
c.restore();
if(!back) {
// Dark rims and glassy, camera-facing eyes.
for(const ex of [202,318]){
ellipse(c,ex,222,30,34,'#775c4b');
ellipse(c,ex,220,26,30,'#eee1cb');
ellipse(c,ex,220,22,27,'#927e51');
ellipse(c,ex,220,17,25,'#24261f');
ellipse(c,ex-7,210,7,9,'#fffdf0');
ellipse(c,ex+8,231,2.5,3,'#ffffff9c');
c.strokeStyle='#b38360'; c.lineWidth=5;
c.beginPath(); c.moveTo(ex-29,203);
c.quadraticCurveTo(ex,191,ex+28,203); c.stroke();
}
ellipse(c,231,278,33,23,'#f9f6ea');
ellipse(c,288,278,33,23,'#f9f6ea');
c.fillStyle='#ad756a';
c.beginPath(); c.moveTo(246,267); c.quadraticCurveTo(260,258,274,267);
c.quadraticCurveTo(263,283,260,282);
c.quadraticCurveTo(256,281,246,267); c.fill();
line(c,260,280,260,295,'#795e51',1.8);
c.strokeStyle='#796558'; c.lineWidth=1.7;
c.beginPath(); c.moveTo(260,293);
c.quadraticCurveTo(248,305,239,295); c.moveTo(260,293);
c.quadraticCurveTo(272,305,281,295); c.stroke();
for(let side of [-1,1]){
for(let i=0;i<4;i++){
ellipse(c,260+side*(29+i*6),281+i%2*7,1.5,1.2,'#977d6c');
c.strokeStyle=i%2?'#e9e3d8ba':'#f9f5ebdd';
c.lineWidth=1.4-i*.17; c.beginPath();
c.moveTo(260+side*31,284+i*5);
c.bezierCurveTo(260+side*91,269+i*9,
260+side*119,269+i*14,260+side*150,280+i*16);
c.stroke();
}
}
}
// Wispy silhouette hairs stop the outline looking like a sticker.
for(let i=0;i<610;i++){
const a=q()*TAU, x=260+Math.cos(a)*126,y=221+Math.sin(a)*112;
if(y<104||y>329) continue;
line(c,x,y,x+Math.cos(a)*(2+q()*8),
y+Math.sin(a)*(2+q()*8),
q()<.5?'#f6dfbb85':'#a87b5960',.4+q()*.6);
}
return cv;
}
const front=makeCat(), back=makeCat(true);
// A short, vowel-shaped vocal recording made entirely from synthesized
// harmonics. Playback rate is the shared control for tempo AND pitch.
function makeVocalBuffer(ac) {
const sr=ac.sampleRate, seconds=1.48, n=Math.floor(sr*seconds);
const buffer=ac.createBuffer(1,n,sr), out=buffer.getChannelData(0);
const vowels={o:[480,920,2750], i:[305,2250,3100], a:[830,1450,2750]};
const seq=[
[0,'o'],[.12,'i'],[.25,'a'],[.39,'a'],
[.47,'o'],[.59,'i'],[.73,'a'],[.86,'a'],
[.95,'o'],[1.08,'i'],[1.20,'a'],[1.36,'a'],[1.48,'o']
];
let phase=0;
for(let s=0;s<n;s++){
const t=s/sr;
let k=0; while(k<seq.length-2 && seq[k+1][0]<t) k++;
const u=ease(clamp((t-seq[k][0])/(seq[k+1][0]-seq[k][0]),0,1));
const form=[0,1,2].map(j=>lerp(vowels[seq[k][1]][j],
vowels[seq[k+1][1]][j],u));
// Gentle natural wobble under the glissando supplied by playbackRate.
const fundamental=153+4*Math.sin(t*TAU*5.1)+2*Math.sin(t*TAU*8);
phase+=TAU*fundamental/sr;
let sample=0;
for(let h=1;h<=30;h++){
const hz=h*fundamental;
const peak=(f,width)=>Math.exp(-.5*((hz-f)/width)**2);
const strength=(.085+peak(form[0],145)*1.4+
peak(form[1],240)*.9+peak(form[2],310)*.38) /
Math.pow(h,.78);
sample+=Math.sin(phase*h+.25*h)*strength;
}
const syllable=t% .47;
const envelope=.68+.32*Math.sin(Math.PI*clamp(syllable/.47,0,1));
out[s]=Math.tanh(sample*.66)*envelope*.54;
}
return buffer;
}
function startAudio() {
if(audio) { audio.resume(); return; }
const AC=window.AudioContext||window.webkitAudioContext;
if(!AC) return;
audio=new AC();
volume=audio.createGain(); volume.gain.value=muted?0:.52;
filter=audio.createBiquadFilter(); filter.type='lowpass'; filter.frequency.value=3900;
const compressor=audio.createDynamicsCompressor();
compressor.threshold.value=-21; compressor.ratio.value=3;
filter.connect(compressor); compressor.connect(volume);
volume.connect(audio.destination);
const buffer=makeVocalBuffer(audio);
voice=audio.createBufferSource(); voice.buffer=buffer; voice.loop=true;
voice.connect(filter); voice.playbackRate.value=.83; voice.start();
voice2=audio.createBufferSource(); voice2.buffer=buffer; voice2.loop=true;
const harmony=audio.createGain(); harmony.gain.value=0;
voice2.connect(harmony); harmony.connect(filter);
voice2.playbackRate.value=.84; voice2.start(audio.currentTime+.09);
voice2.harmonyGain=harmony;
}
function resize() {
dpr=Math.min(devicePixelRatio||1,2);
cw=innerWidth; ch=innerHeight;
canvas.width=Math.ceil(cw*dpr); canvas.height=Math.ceil(ch*dpr);
fit=Math.max(cw/W,ch/H);
ox=(cw-W*fit)/2; oy=(ch-H*fit)/2;
}
addEventListener('resize',resize); resize();
function drawSprite(c,x,y,scale,turn,alpha=1,blur=0) {
c.save(); c.globalAlpha=alpha;
c.translate(x,y); c.scale(scale,scale);
const cosine=Math.cos(turn);
// Narrow edge-on silhouettes, with the back actually replacing the face.
const width=Math.max(.075,Math.abs(cosine));
c.scale(width,1);
if(cosine<0) c.scale(-1,1);
if(blur) c.filter=`blur(${blur}px)`;
c.drawImage(cosine<0?back:front,-260,-590);
c.restore();
}
function furnitureOrbit(c,t,amount) {
const items=[
['lamp',0],['frame',1],['plant',2],['cushion',3],
['lamp',4],['frame',5],['cushion',6]
];
items.slice(0,stage===2?3:items.length).forEach(([type,i])=>{
let a=t*(.53+i*.04)+i*TAU/items.length;
let radius=(stage===2?245:315)+Math.sin(t+i)*22;
let x=550+Math.cos(a)*radius, y=370+Math.sin(a)*radius*.43;
c.save(); c.translate(x,y); c.rotate(a+t*(i%2?-.4:.6));
c.globalAlpha=.36+amount*.3;
c.shadowColor='#ffe0a7'; c.shadowBlur=13;
if(type==='frame') {
c.fillStyle='#5c4b40'; c.fillRect(-28,-35,56,70);
c.fillStyle='#ddd2bd'; c.fillRect(-23,-30,46,60);
c.fillStyle='#8b9981'; c.fillRect(-18,-25,36,50);
} else if(type==='plant') {
c.fillStyle='#b48261'; c.fillRect(-13,7,26,23);
c.strokeStyle='#465f4b'; c.lineWidth=7;
for(let j=-2;j<=2;j++){
c.beginPath(); c.moveTo(0,8);
c.quadraticCurveTo(j*19,-42,j*23,-33); c.stroke();
}
} else if(type==='lamp') {
c.fillStyle='#e6cfab'; c.beginPath();
c.moveTo(-21,-26); c.lineTo(21,-26); c.lineTo(13,3);
c.lineTo(-13,3); c.fill();
line(c,0,3,0,34,'#655345',4);
} else {
c.fillStyle='#ac8a72';
c.beginPath(); c.roundRect(-28,-23,56,46,9); c.fill();
line(c,-24,-16,24,16,'#d6b798',2);
}
c.restore();
});
}
function draw(now) {
const dt=Math.min((now-last)/1000,.045); last=now; time+=dt;
const target=[0,15,24,34,46][stage]+Math.min(extra*3,12);
speed=lerp(speed,target,1-Math.exp(-dt*(stage?1.15:3)));
angle+=speed*dt;
const height=[0,94,171,244,298][stage]+Math.min(extra*9,55);
lift=lerp(lift,height,1-Math.exp(-dt*1.7));
if(audio) {
const rate=clamp(.78+speed*.073,.78,4.4);
voice.playbackRate.setTargetAtTime(rate,audio.currentTime,.12);
voice2.playbackRate.setTargetAtTime(rate*1.012,audio.currentTime,.15);
voice2.harmonyGain.gain.setTargetAtTime(stage>=3?.19:0,audio.currentTime,.2);
filter.frequency.setTargetAtTime(2600+stage*900,audio.currentTime,.2);
}
const c=ctx;
c.setTransform(dpr,0,0,dpr,0,0);
c.fillStyle='#302923'; c.fillRect(0,0,cw,ch);
c.translate(ox,oy); c.scale(fit,fit);
c.save(); c.beginPath(); c.rect(0,0,W,H); c.clip();
// The room first sways, then loses its claim to being a fixed reference.
if(stage<2) {
c.save();
if(stage===1) {
c.translate(550,365); c.rotate(Math.sin(time*1.5)*.006);
c.scale(1.013,1.013); c.translate(-550,-365);
}
c.drawImage(room,0,0); c.restore();
} else {
const strength=stage===2?.022:stage===3?.11:.27;
c.fillStyle=stage===4?'#32263b':'#483b36'; c.fillRect(0,0,W,H);
c.save(); c.translate(550,370);
c.rotate(Math.sin(time*(stage===4?.76:.44))*strength);
let s=stage===2?1.07:stage===3?1.18:1.3;
c.scale(s,s); c.translate(-550,-370);
c.drawImage(room,0,0); c.restore();
if(stage>=3) {
// Receding, translucent copies of the room make a rotating tunnel.
for(let i=5;i>=1;i--){
c.save(); c.translate(550,357);
const s=.18+i*.125;
c.rotate(time*(.15+i*.038)*(i%2?-1:1)+i*.19);
c.scale(s,s); c.translate(-550,-357);
c.globalAlpha=stage===4?.105:.065;
c.drawImage(room,0,0); c.restore();
}
}
}
if(stage>=2) furnitureOrbit(c,time,clamp((time-clickTime)*2,0,1));
// Ground contact remains visible as the cat rises.
const shadow=grad(c,550,617,190+lift*.35,[
[0,`rgba(43,30,24,${.48-lift*.0008})`],
[.65,'#39271a21'],[1,'#39271a00']
]);
c.save(); c.translate(550,616); c.scale(1,.24);
ellipse(c,0,0,190+lift*.32,145,shadow); c.restore();
const bob=stage?Math.sin(time*(2+stage*.7))*Math.min(5+stage*3,19):0;
const cy=625-lift+bob;
if(stage) {
// Warm motion arcs, not white flashes.
c.save(); c.translate(550,cy-205);
for(let i=0;i<Math.min(stage+1,5);i++){
let radius=75+i*38+stage*9;
c.beginPath();
c.ellipse(0,0,radius,radius*.52,
time*(i%2?-.8:.7),time*1.1+i,time*1.1+i+Math.PI*1.35);
c.strokeStyle=['#ffd99c88','#f6b18466','#f7ead280','#b3c6d37a','#efb5ca80'][i];
c.lineWidth=1.5+i*.55; c.stroke();
}
c.restore();
// Multiple angular samples make the cat unreadable at full speed.
const count=stage===1?6:stage===2?9:13;
for(let i=count;i>=1;i--){
const p=i/count;
const a=angle-speed*p*.095;
const x=550+Math.sin(a)*((stage>=3?20:8)*p);
drawSprite(c,x,cy+Math.sin(a*2)*p*4,.78,a,
(.035+(1-p)*.045)*(stage>=3?1.5:1),stage>=3?2:1);
}
}
drawSprite(c,550,cy,.78,angle,stage? .83:1,stage>=3?1.4:0);
if(stage>=3) {
// The room's objects begin orbiting the cat instead of the other way around.
furnitureOrbit(c,time+Math.PI,1);
if(stage===4) {
// Stage four: a little impossible procession of synchronized cats.
for(let i=0;i<7;i++){
const a=time*.62+i*TAU/7;
const radius=220+32*Math.sin(time*1.3+i);
const depth=(Math.sin(a)+1)/2;
c.save();
c.globalAlpha=.4+depth*.38;
drawSprite(c,550+Math.cos(a)*radius,
350+Math.sin(a)*105, .19+depth*.13,
angle+i*.8, .55+depth*.3,1);
c.restore();
}
c.save(); c.translate(550,350);
for(let i=0;i<3;i++){
c.beginPath();
c.ellipse(0,0,295+i*63,95+i*23,
time*(i%2?-1:1)*.38,0,TAU);
c.strokeStyle=['#ffe6b777','#b8ced280','#e3b8a879'][i];
c.lineWidth=3; c.stroke();
}
c.restore();
}
}
c.restore();
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
canvas.addEventListener('click', e=>{
const x=(e.clientX-ox)/fit, y=(e.clientY-oy)/fit;
// The first click must find the cat; afterward the whole unruly room responds.
if(stage===0 && (x<393||x>707||y<175||y>639)) return;
if(stage<4) stage++;
else extra++;
clickTime=time;
hint.classList.add('hidden');
startAudio();
});
muteButton.addEventListener('click', e=>{
e.stopPropagation();
muted=!muted;
muteButton.textContent=muted?'Sound off':'Sound on';
muteButton.setAttribute('aria-label',muted?'Unmute sound':'Mute sound');
if(audio) volume.gain.setTargetAtTime(muted?0:.52,audio.currentTime,.04);
});
})();
</script>
</body>
</html>
The notes
- The opening uses a perspective floor, window light, contact shadow, layered furniture, gradients, grain, and thousands of fine fur strokes. Up close, the painted geometry gives it away.
- The cat begins square to camera and motionless; clicking starts a vertical-axis turn that accelerates into overlapping, unreadable silhouettes while the “oiia” vocal climbs with it.
- Stage 1: lift and spin. Stage 2: a higher flight and floating furnishings. Stage 3: the room becomes a rotating tunnel. Stage 4: synchronized miniature cats orbit inside a procession of furniture and light rings; later clicks push it further.
- Web Audio builds the vocal from harmonics shaped by moving “o,” “i,” and “a” formants. The vocal buffer’s playback rate controls both its repetition rate and pitch, using the same speed value as the spin.
- With more time, I’d replace the procedural cat with a more convincing hand-made, multi-angle cat rendering—especially for the first half-turn.
Attachments
openai/gpt-6-sol-pro — page