Top #Illusion dweets

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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KilledByAPixel

remix of d/34891 by u/KilledByAPixel

function u(t) {

for(T|=0;t<3&&T++%30;)for(e=T**.5/4%1,q=e<.2&&e*10*.157,i=20;i--;x.beginPath(x.stroke()))x.arc(960,540,T*T/2e4,a=2*i*.157+q,a+.157)

Feb 22 2026 4:51 AM UTC

}// 131/140

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Fraser Spiral 💫

u/KilledByAPixel

https://en.wikipedia.org/wiki/Fraser_spiral_…
u/dee-gomma

Had to move the mouse over a circle to convince myself it is not a spiral :)
u/ximavus

wait is it not a spiral
u/KilledByAPixel

#illusion
u/joeytwiddle

These scientists are trying to trick us, and not even hiding it!

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KilledByAPixel

function u(t) {

for(i=3e3;i--;x.fillRect(960+r*S(a=i/19),540+r*C(a),S(i+t*S(t))**8,t))r=t*60

Nov 30 2025 6:37 PM UTC

}// 76/140

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Hypnotic Swirl 👁️

u/New_Core

r=t*t*2 is pretty nice
u/ximavus

#illusion nice one
u/ximavus

I made this snippet though its 144/140 chars: z=_=>S(t+_*Math.random())*255 for(i=3e3;i--;){r=t*t*S(t);x.fillStyle=R(z(i),z(i),z(i));x.fillRect(960+r*S(a=i/19),540+r*C(a),S(i+t*S(t))**8,t);}
u/ximavus

based on this one of course

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metamero

remix of d/11172 by u/metamero

function u(t) {

eval(unescape(escape`挮睩摴栽ㄹ㈰㭣⹳瑹汥⹢慣歧牯畮搽✣㤹㤧㭦潲⡰㴮㔻瀼㤹㬫⭰⥦潲⡱㴰⸵㭱㰹㤻⬫焩睩瑨⡸⥢敧楮偡瑨⠩ⱡ牣⡲㵰⨹㤬猽焪㤹ⰱ㌬〬㜩ⱦ楬汓瑹汥㴧⍦晦✬晩汬⠩ⱦ楬汓瑹汥㵒⠩ⱦ楬汒散琨爭㤱ⱳⴹㄬ㠳ⰸ㌩`.replace(/u(..)/g,"$1%")))

Nov 27 2018 12:01 PM UTC

}// 140/140

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Find the Black Dots - Scintillating Grid Illusion

u/metamero

c.width=1920;c.style.background='#999';for(p=.5;p<99;++p)for(q=0.5;q<99;++q)with(x)beginPath(),arc(r=p*99,s=q*99,13,0,7),fillStyle='#fff',fill(),fillStyle=R(),fillRect(r-91,s-91,83,83)
u/metamero

#OpticalIllusion #Scintillating #Grid #Illusion
u/katkip

#illusion
u/metamero

#ScintillatingGridIllusion

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KilledByAPixel

function u(t) {

for(c.width|=j=0;j<2e4;x.fillRect(...j++?[j/7,S(a)*19+j%12*99,3,9]:[460,0,1e3,2e3]))x.fillStyle=R(v=j?(j%2?S:C)(a=j/200-t)<0?79:210:139,v,v)

Aug 29 2025 4:36 AM UTC

}// 140/140

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Pointy vs Round Lines #Illusion

u/KilledByAPixel

https://www.reddit.com/r/opticalillusions/co…

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KilledByAPixel

remix of d/32728 by u/KilledByAPixel

function u(t) {

z=t*20|0
for(c.width=i=240;i--;)for(j=135;j--;)x.fillRect(i,j,1,S(((i%32-16)**2+(j%32-16)**2<99-S(t)*99+49?(j>>5)*32+i%32-z:j-z)**9)**2)

Nov 10 2024 7:29 PM UTC

}// 136/140

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Animated Coffer Illusion 🔮

u/cantelope

#coffer #cofferillusion
u/joeytwiddle

Great illusion and great dweet! #illusion #opticalillusion

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ntsutae

remix of d/20669 by u/tomxor

function u(t) {

for(c.width&=i=8320;i--;)
x.fillRect(X=i&127,Y=i>>7,
k=S(8*t+X*X-3*Y*Y+19*X*Y)+.5,k)

Nov 18 2020 4:30 PM UTC

}// 84/140

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u/tomxor

#illusion This is messing with my eyes! looks like continuous rotating slices without ever getting beyond 90 degrees
u/joeytwiddle

Travelling without moving
u/ntsutae

I didn't have enough understanding and respect for the work

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rodrigo.siqueira

remix of d/13119 by u/rodrigo.siqueira

function u(t) {

c.width+=X=Y=Z=d=.04
for(i=6e3;i--;)X+=-d*(Y+Z),
Y+=d*(X+.2*Y),
Z+=d*(.2+Z*(X-5)),
x.lineTo(980+80*(X*C(t)-Y*S(t)),800-Z*48+Y*19)
x.stroke()

Jan 12 2020 12:43 AM UTC

}// 140/140

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Turning Rössler Strange Attractor, a system of three non-linear ordinary differential equations with chaotic dynamics and fractal properties. Some people see this turning clockwise, some see counterclockwise due to the bistable optical illusion (search "Spinning Dancer" for explanation). #attractor #illusion

u/rodrigo.siqueira

The rotation effect trick X*C(t)-Y*S(t) was "borrowed" by Frank Force KilledByAPixel's #Lorenz Attractor: from https://www.dwitter.net/d/14752

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f8f82804

remix of d/9671 by u/f8f82804

function u(t) {

with(x)for(i=c.width^=0,arc(960,530,475,0,7),clip();beginPath(),i--;fill())C(t-i)>0&&arc(960+(i*960-i*i)**.5*S(t-i),48+i,9,0,7)

Sep 5 2018 7:03 PM UTC

}// 127/140

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proof-of-concept for #clip #mask to help clean up the edges of a #sphere

u/joeytwiddle

This is doing something weird to my eyes! #illusion

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soggypretzels

function u(t) {

c.width|=0;for(i=999;i--;){x.globalCompositeOperation='xor';q=(i%2*2-1);x.fillRect(i*30-(q*t*9)-6000+q*i/9,q*300+(S(t+i/5)*99*q)-99,30,999)}

Jul 13 2018 12:48 PM UTC

}// 140/140

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u/magna

WOWZA!
u/joeytwiddle

#illusion

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KilledByAPixel

remix of d/34889 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󥌽󯭔󯌱󒭷󪝴󪌨󮌩󩭯󬬨󩭩󫍬󤽴󮝬󩜽󙼣󝼷󝼧󛍴󯍼󩭩󫍬󤭥󨽴󚌰󛌰󛌲󩜳󛌲󩜳󚜬󬬽󭌪󝽥󜼬󪜽󪼽󬬾󟬴󟌼󜜻󪜭󛜻󩭩󫍬󚌩󚝦󫽲󚍢󩝧󪝮󤍡󭍨󚍪󟜶󚜻󪬭󛜻󩭩󫍬󤽴󮝬󩜽󪜥󜬿󤬨󚜺󙼣󩭦󩬧󚝡󬭣󚌹󝬰󚽲󚭓󚍡󟝩󛽫󚬷󜜰󚜬󝜴󜌫󬬪󠼨󨜩󛌲󞜬󨬽󪬪󜼳󚼹󝜫󥌯󜼭󨜬󨬩`.replace(/u../g,'')))

Feb 19 2026 11:44 PM UTC

}// 140/140

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False Spiral Illusion 👁️

u/KilledByAPixel

#illusion

dwitter.net | #Illusion