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function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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taupelink

remix of d/35594 by u/taupelink

function u(t) {

eval(unescape(escape`󩭯󬬨󫜽󭌿󜌺󝝥󜼻󫜭󛜻󮌮󩭩󫍬󚌩󚝸󛭢󩝧󪝮󤍡󭍨󚍸󛭦󪝬󫍓󭍹󫍥󟝒󚍪󟝭󚬪󚍰󟜮󝌫󣝡󭍨󛭲󨝮󩍯󫜨󚜯󝜩󛍩󟝭󙜴󜌱󚭰󚬪󛬵󛍭󙜱󞜷󛍱󟝃󚍭󚜪󚬴󛼴󜌩󚜬󮍛󪜼󪬿󙽲󩝣󭌧󞬧󨝲󨼧󧜨󦌽󫜥󝌱󚬴󞌬󫜪󫜥󜬳󚬴󞌬󪬯󬜪󚍓󚍘󚭱󚜪󤼨󫜪󫜩󚽓󚍭󚜩󚬪󝌪󬌬󪜬󪜭󜬩`.replace(/u../g,'')))

Jun 16 2026 2:12 AM UTC

}// 139/140

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d/35621 - refresh for slight variation - draws 5K shapes just once

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taupelink

remix of d/35618 by u/taupelink

function u(t) {

for(i=z=w=1080;i--;x.fillRect(480*t,i,15,w))x.fillStyle=`hsl(${6**(w&=3)},${85-(z&=7)*3}%,${7*(z+=5+C(w+=t-z*C(i/360-z))*S(t*3/w-z)*w)}%,.5`

Jun 15 2026 9:12 PM UTC

}// 140/140

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d/35620

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mathisvdr

remix of d/35567 by u/taupelink

function u(t) {

for(i=z=1080;i--;x.fillRect(160*t,i,6,z*=1+C(i/105/p)*C(t/p)))x.fillStyle=`hsl(${6**(z&=7)},50%,${300/(z+=3-(p=(-.7)**z)*C(t+i/210*p))}%,.3`

Jun 15 2026 7:19 PM UTC

}// 140/140

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taupelink

remix of d/35604 by u/taupelink

function u(t) {

for(i=z=2e3;i--;x.fillRect(i,300*t,w,z))x.fillStyle=`hsl(${5**(w=z&3)},${55-2**(z&=7)/4}%,${5*(z+=6+w*C(w+=6-z*S(i/525-z))*S(t/6*z-w))}%,.5`

Jun 15 2026 1:41 PM UTC

}// 140/140

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d/35618 Abstract forest scene

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46uuuu

function u(t) {

utils={noop(){},identity:x=>x,sum:(x,y)=>+x+ +y,abs:i=>i>0?i:-i,randomString:_=>btoa(Math.random()),toFunctn:x=>/fu/.test(typeof x)?x:_=>x}

Jun 15 2026 11:52 AM UTC

}// 139/140

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Micro utility (6 utils)

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SockTaters

function u(t) {

s="💀☠️🐚🔳🥋🧾📧"
for(i=0;i<14;x.font='50px sa',x.fillText(i/2,23+i*99,112))x.font='10px sa',x.fillText(s[i++]+s[i++],30+i*99+S(t)*30,99+C(t)*30)

Jun 15 2026 6:15 AM UTC

}// 140/140

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What's your OS and which moving dot(s) look best on it?

u/taupelink

Fun! I'm on iOS/Safari right now. I like (1) and (3) best. (3) is colorful and eyecatching, (1) is more elegant and subtle.

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46uuuu

function u(t) {

Jun 15 2026 2:28 AM UTC

}// 1/140

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#syntaxerror in empty dweet

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rodrigo.siqueira

remix of d/35580 by u/rodrigo.siqueira

function u(t) {

for(X=Y=i=4e4;i--;x.fillRect(Y*260+960,920-X*480,t<1,.1))u=X-1.01,r=(u*u+Y*Y)**.5,s=T(i*i/t)<2||-1,X=s*(r+u)/3+S(X),Y=s*(r-u)**.7*(Y<0||-1)

Jun 14 2026 11:38 PM UTC

}// 139/140

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Ciliated double spiral

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joeytwiddle

function u(t) {

c.width|=W=500,J=255
for(i=8;i--;x.fillRect(W*X,W*Y,W,W))X=i%4,Y=i>>2,k=(3+i)/t,f=t%k<k/2?i:i^7,x.fillStyle=R(J*(f&1),J*((f&2)/2),J*((f&4)))

Jun 14 2026 10:59 PM UTC

}// 140/140

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8 primary colours flashing (sorry)

u/joeytwiddle

I just made this to explain my 8-bit childhood trauma to a friend
u/joeytwiddle

Long ago I noticed that the brightness of the colours increases in an alternating fashion: 0,4, 1,5, 2,6, 3,7. Paste ,c.style.filter='saturate(0%)',t=0 at the top to see this. It seemed to me to be intentional but odd. Now I realise it's simply because blue is the darkest primary, with red and green following. So we can get a smooth gradient by moving J*(f&1) from the first argument to the last.

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taupelink

remix of d/35605 by u/taupelink

function u(t) {

f=(v,m=7)=>m?f(Math.abs(v%16-6-4/m),m>>1):v;g=n=>f(X/n)+f(Y/(8-n))&3;for(i=1e4>>t;i--;x.fillRect(4*X,4*Y,g(3)&g(5),g(4)))X=i*t%480,Y=X*i%270

Jun 14 2026 10:40 PM UTC

}// 140/140

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d/35609