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.

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KilledByAPixel

function u(t) {

eval(unescape(escape`󭽩󭍨󚍸󚝦󫽲󚍫󟝙󟜵󝌰󞽫󛜭󞽢󩝧󪝮󤍡󭍨󚍦󪝬󫌨󚜩󚝩󟝫󙜲󛍭󫽶󩝔󫼨󦌽󝜱󜌫󪜪󞜰󜌬󦜩󛍡󬭣󚍘󛍙󛍛󜼰󛌳󜜬󝌹󛌵󜌬󦝝󦽪󟝫󛼹󝍼󜍝󚬸󛍰󟝫󛼱󝜬󪬿󬌫󛬲󞬹󚜬󩭩󫍬󤽴󮝬󩜽󨍨󬽬󚌤󮼨󪬭󜜩󚭓󚍴󛼲󚜪󜼰󚼳󛬸󚭫󚽴󚬳󝬰󚬨󪜪󜬭󜜩󯜠󙍻󪬭󝌦󪬪󦝽󙜵󜌥󨌻`.replace(/u../g,'')))

Jun 16 2021 3:04 AM UTC

}// 139/140

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Growing/Shrinking Wheel Illusion

u/KilledByAPixel

inspired by @jagarikin #illusion
u/tomxor

O_o
u/rep_movsd

For some reason it looks like one comes forward and another goes back
u/KilledByAPixel

Yes, that is the illusion! It swaps between which one is forward or back

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BriSeven

function u(t) {

w=c.width
for(i=0;i<w;i++)
x.fillStyle=R(S(6*i/w)*255*S(t),-C(6*i/w)*255*C(t/2),-S(6*i/w)*255*S(t/4)),x.fillRect(i,200*(t%5),1,50)

Mar 9 2020 11:46 PM UTC

}// 130/140

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Colored lights

u/joeytwiddle

I think they are still images but my brain tells me they are shrinking outwards! #illusion

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pavel

function u(t) {

for(i=36;--i;x.fillRect(m?Math.abs(9*t%53-26)<<6:i*60-210,m*i*327,60<<2*m,m?99:2e3))m=i<3,x.fillStyle=m?i%2?'#ff0':'#00a':i%2&t/4?R():'#eee'

Feb 9 2020 1:50 AM UTC

}// 140/140

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Stepping feet #illusion

u/katkip

#opticalillusion
u/veubeke

@pavel Sorry, I didn’t see your dweet. I deleted mine and will do a better job searching next time.
u/pavel

I was just cross-posting mine as they were on the same topic without a clear keyword. You should have kept yours, it was clearly different.

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AnnanFay

function u(t) {

with(x)for(i=n=t<32?1<<t/4:256;i--;beginPath(fill(arc(920+S(g=i/n*6.28)*(k=S(g+t)*460),540+C(g)*k,60,0,7))))fillStyle=`hsl(${t*99},100%,60%`

Mar 7 2018 4:13 PM UTC

}// 140/140

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This is my version of the wheel. Thanks to yonatan and Bálint for parts.

u/katkip

#illusion

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anotherkitten

function u(t) {

c.width|=0
s=C(t/7)*10.5+27.5
w=(1920+1920/s)/s
for(i=2e3;i--;)x.fillRect(i%s*w,50+(i/s|0)*100,-w,i%2?-50:50)

Mar 17 2022 3:13 PM UTC

}// 110/140

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u/rep_movsd

#illusion

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KilledByAPixel

function u(t) {

for(c.width|=L=300,k=2435;k--;x.arc(982,552,(z*2-1)*(4*L-k),q=(k%L/L*8*((k/L|0)%2*2-1)+t+z)*22/7,q))z=k<4*L;x.fill()

Oct 30 2019 6:08 PM UTC

}// 116/140

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Hypnotic Spiral

u/KilledByAPixel

#illusion

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KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁺👴🀱𛁩🐲𞐹𞱩𛐭𞱳𪁡𩁯𭱂𫁵𬠽𮠪𝀰𚑦𫱲𚁪🐹𞱪𛐭𞱦𪑬𫁒𩑣𭀨𦀽𮠿𪐪𞐹𞡩𚠹𛐹𞐬𦐽𮠿𭀪𝡥𜰺𭀪𝐴𜀭𝠰𜀬𭰽𮠿𜠹𞠹𛀨𮡼𯁍𨑴𪀮𪁹𬁯𭀨𦀭𞐶𜀬𦐭𝐴𜀩🠴𞀰𚐪𭰩𚑳𪁡𩁯𭱃𫱬𫱲👦𪑬𫁓𭁹𫁥👓𚁴𚡩𚡴𚡩𚐼𮠿𘠣𜀰𜀢𞠢𘱆𡡆𘠻`.replace(/u../g,'')))

Oct 24 2019 5:52 PM UTC

}// 140/140

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Dizzy Dots

u/magna

Dude.
u/katkip

#illusion #opticalillusion
u/Xen

Yess
u/KilledByAPixel

#Inktober day 24: Dizzy

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rodrigo.siqueira

function u(t) {

x.fillStyle='gray';x.fillRect(250,440,1420,200)
x.fillStyle=R(t*70,t*70,t*70)
x.fillRect(t*510,0,9,1080)

Sep 27 2019 2:25 PM UTC

}// 104/140

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Illusory gradient grayscale ("Simultaneous Contrast Illusion"). The bar in the middle is a CONSTANT SHADE of gray. Viewing two colors at the same time influences both of their appearances. #gradient #illusion

u/iverjo

#opticalillusion

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katkip

function u(t) {

c.width|=0;x.translate(z=960,540);for(i=7;i--;x.fillRect(-z,0,2e3,4))x.beginPath(),x.fill(x.arc(S(t+i*1.68/4)*500,0,50,0,7)),x.rotate(.45)

Aug 24 2019 12:27 PM UTC

}// 138/140

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That #illusion that everybody knows but not very precise because of golfing. https://media1.tenor.com/images/4ba3468dfd7f…

u/aleamb

relaxing!

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KilledByAPixel

remix of d/14726 by u/KilledByAPixel

function u(t) {

c.width|=X=Y=Z=1
for(i=2e3;i--;x.lineTo(960+(X*C(t)-Y*S(t))*43,1160-Z*23))Z+=(X*Y-Z)/39,X+=(Y-X)/11,Y+=X*(27-Z)/96
x.lineWidth=9
x.stroke()

Jun 25 2019 3:04 PM UTC

}// 139/140

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3D #Lorenz Attractor 2

u/aleamb

#d3 #attractor
u/katkip

what is that rotation? clockwise or counter clockwise #illusion
u/katkip

not really 3D. the perspective is the save everywhere
u/katkip

it is 3D because the attractor is in space, but there is no perspective effect

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