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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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iverjo

function u(t) {

c.width=2e3;for(i=4e3;i--;)s=149/(i*3+199),q=s*99,x.fillRect(2e3*(T(i/9)+s*t)%2100-q,540+540*S(s*2e3),q,q)

Feb 21 2016 8:49 PM UTC

}// 106/140

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Try this in full screen. Move your head close to the screen and focus on one of small, slow-moving dots. It probably feel like you are moving sideways.

u/iverjo

You brain might also trick you into believing that the smallest dots are moving right
u/iverjo

I mean left
u/aemkei

down to 87 bytes: https://www.dwitter.net/d/2180
u/iverjo

#parallax

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KilledByAPixel

remix of d/35954 by u/KilledByAPixel

function u(t) {

eval($=unescape(escape`󨼮󭽩󩍴󪍼󟝁󟜱󞜸󒭦󫽲󚍩󟜷󞼭󛝩󞽸󛭦󪝬󫍔󩝸󭌨󙌬󜌬󪜪󜜶󚜩󮌮󩭯󫭴󟜧󜝥󫜢󙼊󩭯󬬨󞽁󞽒󚼽󛬰󜜩󚌨󦌽󭌫󚍥󟝒󛼹󞜩󚭁󛝒󚝞󤬩󙜳󯍼󮌮󩍲󨝷󢝭󨝧󩜨󨼬󚍘󚽒󚼹󚜥󜜳󚬹󞜬󤬽󜜬󩜪󞜬󞜹󛍁󛜭󚬱󜌬󝜴󜌭󝌯󩜬󜜲󛌹󛽥󚜊󮌮󨽬󩝡󬭒󩝣󭌨󜌬󜌬󜭥󜼬󞜹󚜻`.replace(/u../g,'')))

Jul 23 2026 8:39 PM UTC

}// 139/140

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Walls of Code 👨‍💻 #quine

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rodrigo.siqueira

remix of d/35930 by u/rodrigo.siqueira

function u(t) {

for(m=t?0:3e4;m--;x['stroke']())i=m&350,x.beginPath(x.strokeStyle=`hsl(${m**.4},82%,${58*S(i/11)}%`),x['arc'](m%2e3,i^m%740,980,0,9)

Jul 20 2026 3:34 AM UTC

}// 132/140

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Interlaced circles

u/magna

Hitting TAB on Propellerhead Reason

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taupelink

remix of d/35708 by u/taupelink

function u(t) {

for(i=z=4e3;i--;x.fillRect(i/2,600*s-r,z+=9+6*S(z*S(z/s)+i/r/8),z))s=t**.3,x.fillStyle=R(r=300-(z=9+6*C((t^z^i/79/z)/8))*z*s,r/s,r/t**t,z/r)

Jul 9 2026 12:44 AM UTC

}// 140/140

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d/35852

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KilledByAPixel

remix of d/34828 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󩭯󬬨󨼮󭽩󩍴󪌦󟝩󟜶󜬷󜬻󪜭󛜻󮌮󩭩󫍬󤽴󮝬󩜽󚍱󟝘󟌳󝬦󦜼󜬷󚜿󙼣󜌲󝜧󞬧󘽢󜌲󙼬󚍱󟽙󛼳󙬱󧭘󛼳󙬱󙬦󦜦󙭘󟌳󝜦󦜼󜬶󞭙󙜸󟬲󯍙󟬵󜜩󯍼󮌮󩭩󫍬󤭥󨽴󚌲󝼫󦌪󛬷󚽘󛼴󞌪󠼨󦌯󞌭󦜯󞜭󭌪󝬩󛌹󚽙󚬮󝼫󦌯󜬰󚭓󚍘󛼱󝬭󭌩󛌱󛍩󟬳󯍼󞜹󚜩󦌽󪜥󞜹󛍙󟝩󛼹󞝼󜌻`.replace(/u../g,'')))

Jul 5 2026 2:16 PM UTC

}// 140/140

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Born in the USA 🇺🇸 #flag

u/KilledByAPixel

corrected number and arrangement of stars! ⭐

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taupelink

remix of d/35678 by u/taupelink

function u(t) {

a=z=>z*z;f=u=>a(a(3*S(u))/2-5-i%3*S(h)-w);for(i=k=1e4;i--;x.fillRect(960+r*C(h=i/k*7),r*S(h),w=t/3,!(f(8*t**.5-4*h)+f(w+12*h)&60)*w))r=120*t

Jun 27 2026 12:28 AM UTC

}// 140/140

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d/35698

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taupelink

remix of d/35669 by u/taupelink

function u(t) {

for(i=z=4e3;i--;x.fillRect(i/2,270*t,w,z/2))x.fillStyle=`hsl(${6**(w=z&3)},${(z&=15)*6}%,${z=(w+=2+t/9-C(i**.35+C(z+=9-7*C(t-z))*w))*z}%,.4`

Jun 23 2026 4:22 AM UTC

}// 140/140

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d/35684 Inspired by the Abstract Expressionists

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taupelink

remix of d/35647 by u/taupelink

function u(t) {

for(i=z=1080;i--;x.fillRect(t*240,i,z/=.9+S(i/r)/e,4))q=.7+z*z%.5,x.fillStyle=R(r=9+(z=z**.9|0)**3/50,r*q,r**q),z+=5+3*S(i**.5-8*C(e=z+t/2))

Jun 22 2026 3:26 AM UTC

}// 140/140

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d/35676

u/katkip

looks like a sci fi desert city

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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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rodrigo.siqueira

remix of d/35560 by u/rodrigo.siqueira

function u(t) {

for(X=Y=i=3e4;i--;x.fillRect(Y*110+960,X*250+380,t<1,.1))u=X%1*2,r=(u*u+Y*Y)**.5,s=S(i*i/t)<.8||-1,X=s*(r+u)/4+S(X),Y=s*(r-u)**.7*(Y<0||-1)

Jun 11 2026 1:00 AM UTC

}// 139/140

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Bioform: Fractal Mosquito

u/UEZ

#bug
u/vain

absolutely incredible und beeindruckendI have no idea how you managed to turn such a detailed and impressive Mosquito into code. It's genuinely mind-blowing. Wow! ❤️👍