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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Current theme challenge: #Opposites

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atgz

remix of d/10010 by u/atgz

function u(t) {

c.width|=i=768;x.transform(1,0,0,1,960,540)
for(i;i--;x.rotate(t/64))x.fillRect(i-=3,i,i/8,i)
x.font=`5em"`
x.fillText((70-t|0)%60,-15,35)

Aug 29 2019 8:15 AM UTC

}// 138/140

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Make this dweet fullscreen, wait for counter to go from 10 to 0, then focus your eyes on the number counting from 60. When the counter goes down to 0, look off from your screen and you will be disoriented

u/joeytwiddle

#illusion

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katkip

remix of d/14466 by u/katkip

function u(t) {

x.fillRect((t*999)%3840-1920,0,c.width=1920,2e3);for(i=9;i--;)x[frame%.4<.2?'fillRect':'clearRect'](400+i*100+S(t)*300,400,50,20+200)

Jun 6 2019 2:27 PM UTC

}// 133/140

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That #default #opticalillusion #illusion #transition

u/metamero

what is the optical illusion on this?? oh, i see, it's the illusion that is cool to flood dwitter hashtags with random stuff
u/13thptr

I didn't look at the code but the default bars look kinda grey at some point

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atgz

remix of d/9723 by u/DataMeta

function u(t) {

c.width|=i=768;x.transform(1,0,0,1,960,540)
for(i;i--;x.rotate(t/64))x.fillRect(i--,i--,i--/8,i)

Sep 22 2018 6:07 AM UTC

}// 96/140

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focus on the middle for a minute then look elsewhere on the screen #illusion

u/joeytwiddle

Fast and funky version: t*=9;c.width|=i=768

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katkip

function u(t) {

x.arc(960,540,40*+Math.abs(T(t)*t),t*t,t);x.fill()
x.globalCompositeOperation='xor';FPS=200

Aug 25 2018 11:33 AM UTC

}// 91/140

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Visual #illusion . Fullscreen and look in the center then look in the middle for 1 minute then look away. See that lines? lol

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katkip

remix of d/9375 by u/katkip

function u(t) {

function F(a,b){return C(a+b+t)<S(a-b)};c.width=w=100;for(i=0;i<=w;i++)for(j=0;j<w;j++)if(F(i,j))x.fillRect(i-1,j-1,1,1)

Aug 23 2018 12:20 PM UTC

}// 120/140

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Visual #illusion

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metamero

function u(t) {

document.body.outerHTML=t?s+=` NN ИИ`:s='<code style=font-size:25px>'

Jan 15 2019 1:30 PM UTC

}// 69/140

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N И Zöllner Illusion - thanks to prof. Akiyoshi Kitaoka - vertically aligned columns appear to tilt alternately

u/metamero

#illusion #zöllner #zollner
u/metamero

see d/11254 for ref on tilt illusions

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katkip

remix of d/11231 by u/katkip

function u(t) {

t||(a=-1,b=0);for(p=69;p--;)x.fillStyle=`hsl(${(b%a+a%b)*frame/3} 99%${50+S(a**b)*10}%)`,x.fillRect(a*10,b*10,10,10),a++,a>192?(b++,a=-1):0;

Dec 1 2018 1:54 PM UTC

}// 140/140

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Visual #illusion . If you move your eyes, this moves too.

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E-Mouse

remix of d/8390 by u/E-Mouse

function u(t) {

for(c.width|=i=2e3;i--;)x.fillRect(S(t*3+i/15)*i+960,C(t*2+i/15)*i+540,W=i/25,W)

Jun 4 2018 1:37 PM UTC

}// 80/140

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Which way is it spinning? #illusion

u/katkip

Both

You've reached the end.

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