Top #opticalillusion 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: #ScaryMovies

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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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rodrigo.siqueira

remix of d/21257 by u/Xen

function u(t) {

for(i=2e3,f=g=>i*g(i/t+i**7);i--;x.fillRect(950+f(C),540+f(S),9/t,1+9/t))x.fillStyle=`hsl(${i/30},80%,${S(i/1e5+t)*99}%,.2`

Jan 13 2021 11:39 PM UTC

}// 123/140

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Dots of light

u/Qwitter

awesome, Im not sure why, but i think this frightens me after staring at it for a while.
u/Xen

nice!
u/iverjo

Put it in fullscreen and look at the center for at least 10 seconds - it might look like the big parts move in a wavy motion. #opticalillusion
u/joeytwiddle

Instructions unclear. Summoned Cthulu.
u/Qwitter

#barkfleshwound

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metamero

function u(t) {

eval(unescape(escape`景爨稽㜲Ᵽ⹷楤瑨簽欽〻欼㈵㔻欫⬩漽⡲ⱳⱡ⤽㹸⹲散琨爬猬愬愩Ⱪ㵫☱㔬樽款㸴ⱪ☽ㄵⱰ㴴㈰⭺⩩ⱱ㵺⩪Ⱪ㰱㔿⠨椫権┲㼰㩯⡰ⱱⱺ⤬漨瀫⡫┲㼴㠺㐩ⱱ⬨欦㈿㐸㨴⤬㈰⤩㨰㭸⹦楬氨❥癥湯摤✩`.replace(/u(..)/g,"$1%")))

Nov 30 2018 5:59 PM UTC

}// 134/140

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#OpticalIllusion

u/katkip

#illusion cool
u/metamero

for(z=72,c.width|=k=0;k<255;k++)o=(r,s,a)=>x.rect(r,s,a,a),i=k&15,j=k>>4,j&=15,p=420+z*i,q=z*j,i<15?((i+j)%2?0:o(p,q,z),o(p+(k%2?48:4),q+(k&2?48:4),20)):0;x.fill('evenodd')
u/ceaga

kanji chester!

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Bugsy

function u(t) {

for(c.width|=r=999;--r;x.lineTo(960+C(r+t)*a,540+S(r+t)*a))a=r/2
x.stroke()

Jun 16 2018 4:32 PM UTC

}// 75/140

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The graph r=theta spinning around the origin. 65 characters to play with, so there's lots of remixing potential. Try messing around with the trig functions, it leads to some fun results

u/iverjo

Go fullscreen, stare at the center for 30 seconds, then look away from your screen (e.g. look at your keyboard). #opticalillusion
u/iverjo

#short

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anotherkitten

function u(t) {

c.width|=0
for(k=270,j=0;k--;j-=S(k/9)>0?1:-1)for(i=40;i--;)x.fillRect(i*99-400-k*C(t*.887)+j*(S(t)*6),k*4,49,4)

Oct 25 2021 2:25 PM UTC

}// 112/140

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shifting floors in the black lodge

u/Xen

nice!
u/DataMeta

#opticalillusion

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KilledByAPixel

remix of d/14103 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𮁛𬰽𙱦𪑬𫁓𭁹𫁥𙱝🐢𘰸𞀸𘠻𮁛𩠽𙱦𪑬𫁒𩑣𭀧𧐨𪠽𜀬𜀬𦠽𜡥𜰬𦠩𒡦𫱲𚁸𛡦𪑬𭁥𬠽𨁢𫁵𬠨𙁻𜡽𩑭𨀻𥀽𭀪𪠯𝐬𪠫𚰼𝰻𚑦𫱲𚁩🐭𝐰𛑔𚠵𙐱𚠳𜀬𤐽𥀪𝐥𜠾𜐻𚁩𚰽𜰰𚐼𝐰𞱸𦱦𧐨𪠪𜠲𞐬𝐴𜀭𪐬𞐹𛀲𝐩𚑸𦱳𧐽𤠨𤐽𦠪𘑑𛁑𛁑𛁃𚁩𛰳𜐮𞀳𚐩`.replace(/u../g,'')))

May 23 2019 5:44 PM UTC

}// 138/140

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Gabor Patches #OpticalIllusion

u/magna

Nice!
u/SMON

+1 for turtle
u/KilledByAPixel

Inspired by this video... https://www.youtube.com/watch?v=Jri0del_6t4 This is all I could fit, maybe someone can take it farther.
u/joeytwiddle

I really like the square in that video
u/KilledByAPixel

#illusion

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pythech

remix of d/8455 by u/pythech

function u(t) {

with(x)for(i=200;i--;fillRect(i*9,!fillText("👤",i%9*200,i*30),9,2e3))fillStyle=`hsl(209,33%,${Math.abs((i+t*50)%62-31)*2+9}%)`,font="9em x"

Jun 6 2018 8:50 PM UTC

}// 139/140

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works with apple emojis only

u/pythech

optical illusion, stare at it for a few seconds
u/DataMeta

cool!
u/iverjo

#opticalillusion

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magna

remix of d/3674 by u/magna

function u(t) {

w=c.width=384;for(i=w*w;i--;x.fillRect(X,Y,1,1))X=i%w,Y=i/w|0,x.fillStyle=R(c=(X+1&30|Y+4&24&&Y+1&30|X+4&24?(X^Y)&32?4:5:X+6&32?3:7)/9*w)

Dec 20 2017 10:47 PM UTC

}// 137/140

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u/iverjo

Love this optical illusion
u/sandromiccoli

delicious
u/magna

#opticalillusion

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iverjo

function u(t) {

for(i=13;i--;)k=i!=12,x.beginPath(),x.arc(960+400*k*C(j=i*.523),540+400*S(j),9+50*k,0,7),x.fillStyle=R(a=255*k,a*(i==(t*9%12|0)),a),x.fill()

Jan 28 2017 6:59 PM UTC

}// 140/140

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Optical illusion: Look at the center dot for at least 5 seconds. What you should see is that the missing dot becomes light green. Keep staring at the same point for another 10-30 seconds, and you might notice that some pink dots will "disappear". This is due to cone fatigue in your eyes.

u/iverjo

Two characters can be shaved by replacing k=i!=12 with k=!!i
u/lionleaf

Haha, amazing!
u/iverjo

#opticalillusion

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