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: #ScaryMovies

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pythech

remix of d/8630 by u/pythech

function u(t) {

c.width|=0
with(x)for(i=3;i--;stroke())beginPath(lineWidth=r=100*C(t+3.14)+200),arc(650+250*i,700-i%2*434,r/2,z=i*2.095,5.235+z)

Jun 17 2018 9:24 PM UTC

}// 128/140

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Imaginary Triangle

u/lionleaf

#illusion
u/iverjo

#opticalillusion
u/Purpzie

You can save 1 character by putting arc(650+250*i,700-i%2*434,r/2,z=i*2.095,5.235+z) in the for loop before stroke()
u/Purpzie

oh wait no you can't it's the same, never mind

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metamero

function u(t) {

eval(unescape(escape`琿挮睩摴桼㵪㴱㔺猽〻潮浯畳敭潶攽攽㹳㵥⹸⽩湮敲坩摴栻稽㜲㭲㴨愬戬挬搬攩㴾筸⹦楬汓瑹汥㵒⡥㼱㈸㨰⤻砮晩汬剥捴⡡⩺⨴Ɫ⩺Ᵽ⩺Ɽ⥽㭦潲⠻樻⥦潲⡲⡳ⱪⴭⰲ㈬㐬椽㘩㬭⵩㬩爨椫⡳⴮㔩⨨樥㈩ⱪⰲⱺ⤻`.replace(/u(..)/g,"$1%")))

Dec 9 2018 9:00 PM UTC

}// 140/140

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#Interactive #CafeWallIllusion

u/metamero

t?c.width|=j=15:s=0;onmousemove=e=>s=e.x/innerWidth;z=72;r=(a,b,c,d,e)=>{x.fillStyle=R(e?128:0);x.fillRect(a*z*4,b*z,c*z,d)};for(;j;)for(r(s,j--,22,4,i=6);--i;)r(i+(s-.5)*(j%2),j,2,z)
u/metamero

#cafewall #illusion #opticalillusion #mouse
u/katkip

nice
u/DataMeta

#hiddengem

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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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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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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

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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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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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.

dwitter.net | #illusion