New #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.

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Current theme challenge: #Food

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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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lewdev

remix of d/34488 by u/ximavus

function u(t) {

for(x.reset(X=120);X--;)for(Y=120;Y--;)X&Y+99*t&&x.fillRect(X*16,Y*9,16,9)
for(i=9;i--;)x.fillRect(S(t)*300+99*i+450,400,50,200)

Nov 26 2025 8:29 PM UTC

}// 128/140

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🔻Scrolling Sierpinsky (golfed -15b) with #default

u/ximavus

#default looks like its falling
u/ximavus

#illusion

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KilledByAPixel

function u(t) {

for(c.width|=i=14;i--;x.beginPath(x.fill(x.arc(540+b*840+S(a=i/.955)*d,540+C(a)*d,i%7?d**1.5*.025:99,0,9))))d=i%7&&C(t+22*(b=i<7))*90+260

Nov 22 2025 6:11 PM UTC

}// 137/140

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Ebbinghaus Illusion ⚫⚫ Center circles are the same size

u/joeytwiddle

#illusion #opticalillusion

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KilledByAPixel

remix of d/23121 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󭽩󭍨󚍸󚝦󫽲󚍫󟝙󟜵󝌰󞽫󛜭󞽢󩝧󪝮󤍡󭍨󚍦󪝬󫌨󨝲󨼨󦌬󦜬󦼳󜌬󜼱󛌴󞜬󝜰󛍙󧝛󪭝󚬸󛍰󟝫󛼱󝜬󪬿󬌫󛬱󝜺󞜩󚜩󚝩󟝫󙜲󛍪󟝫󛼹󝍼󫝯󭭥󥍯󚍘󟝙󚽩󚬹󜌰󛍙󚜬󩭩󫍬󤽴󮝬󩜽󨍨󬽬󚌤󮽪󚬳󜌭󜼰󚼳󛬸󜼪󪼫󭌪󝼲󜌪󚍩󛜮󝜩󯜠󙍻󪬥󝌦󙬹󜍽󙜵󜌥󨌻`.replace(/u../g,'')))

Nov 4 2025 4:29 PM UTC

}// 134/140

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Growing/Shrinking Wheel 🌈 #Illusion

u/joeytwiddle

Effective!
u/ximavus

looks actually very good

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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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tzador

function u(t) {

c.width|=0
for(i=9119;--i;){
 R=(S(i*999)**2)%1
 O=(C(i*899)**2*999)%1+t/9/R
 X=C(O)*R*4
 Y=S(O)*R*8
 x.fillRect(X*444+955,Y*222+555,5,5)
}

Feb 8 2025 3:49 PM UTC

}// 139/140

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Look at it for 5 seconds, then look at your code #spiral #illusion

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KilledByAPixel

function u(t) {

eval(unescape(escape`󭽩󭍨󚍸󚝦󫽲󚍢󟜹󝼲󞽢󛜭󞽢󩝧󪝮󤍡󭍨󚍦󪝬󫌨󨝲󨼨󪜪󞌳󚼴󜌫󡬨󤼩󛍴󚬵󩜳󛜴󜌫󡬨󠼩󛍴󟼲󜌺󜝥󝌬󜌬󞜩󚜩󚝩󟝢󟬾󜬬󪼽󨬥󝌬󩭩󫍬󤽴󮝬󩜽󭌿󪼿󪼾󜜿󤬨󚜺󙼣󩭦󩬧󞬧󘼲󜭦󙼺󙼣󝭢󜌧󛍆󟝦󟜾󚍫󟬱󟼭󝬺󝬪󪼩󚭦󚍩󛼲󚽴󚬳󜌩`.replace(/u../g,'')))

Nov 11 2024 1:46 PM UTC

}// 127/140

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Illusory Motion Illusion ⚪🔵⚫

u/magna

DAMN
u/cantelope

🤮
u/joeytwiddle

#illusion #opticalillusion

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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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KilledByAPixel

function u(t) {

c.width|=0
for(i=1e4;i--;x.fillRect(...b?[i/5-70,540+200*C(i/25),9,9]:[(t*99+i*w)%3e3,140,9-w,800]))w=i<35?29:34,x.fillStyle=R(b=i>80&&i)

Jul 13 2024 2:21 PM UTC

}// 137/140

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Wave Mover #illusion demake of https://x.com/jitanpon/status/18120295973426…

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timothytomato

function u(t) {

c.width=1080
for(i=0;i<200;i++)
x.fillRect(10*i,300-(S(t+i)*100),20,10)

Nov 2 2023 11:16 PM UTC

}// 71/140

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Rotating Cylinder Optical Illusion

u/timothytomato

#illusion

dwitter.net | #illusion