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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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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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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

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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katkip

function u(t) {

q=4;for(i=212;i--;)x.beginPath(),x.fillStyle=['#DD1',R(),"#06D","#fff"][i%4],x.arc(260+C(i*q)*i+(t|0)*600,540+S(i*q)*i*2,i,0,7),x.fill();

Jun 16 2019 7:28 AM UTC

}// 137/140

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Move your eyes randomly to see them move #opticalillusion #illusion

u/joeytwiddle

I was not here

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KilledByAPixel

remix of d/14618 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩠽𩡲𨑭𩐻𭱩𭁨𚁸𚑦𫱲𚁢𩑧𪑮𤁡𭁨𚁦𪑬𫁓𭁹𫁥🐢𘱃𠱃𘠩𛁦𪑬𫀨𨑲𨰨𩠪𜠷𜀭𝠵𞐬𝐴𜀫𜰵𜀪𤰨𩠪𜐮𝠩𛀱𜰰𛀰𛀷𚐩𛁩🐹𞐻𪐭𛐻𭀦𙡩𙐳𘐽𩠥𜱼𯁦𪑬𫁒𩑣𭀨𩠪𜠷𜀭𞀰𜀬𪐪𜐶𛁴🰴𞀰𞠴𩐳𛀱𝠩𚑦𪑬𫁓𭁹𫁥👩𙐳🱩𙐳🐽𜐿𘠣𜀰𡠢𞠢𘰰𡠰𘠺𘠣𡠰𜀢`.replace(/u../g,'')))

Jun 15 2019 7:07 PM UTC

}// 140/140

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3 Color Munker Illusion ~ All circles are same shade of grey #OpticalIllusion

u/joeytwiddle

fillStyle='#'+'00F00'.substr(i%3,3) although substr is deprecated
u/joeytwiddle

I think this one works better than the one on Twitter!
u/katkip

#illusion

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KilledByAPixel

function u(t) {

eval(unescape(escape`昽晲慭攻睩瑨⡸⥦潲⡢敧楮偡瑨⡦楬汓瑹汥㴢⌹㤹∩ⱦ楬氨慲挨昪㐸〭㜱㤬㘴〫㐳〪匨昪昩ⰲ㄰ⰰⰷ⤩Ⱪ㴹㤻椭ⴻ琦♩┲㴽春㉼籦楬汒散琨昪㐸〭㤶〬椪ㄹⱴ㼴㠰㨴攳ⰹ⤩晩汬却祬攽椦ㄿ∣〰䘢㨢⍆〰∻`.replace(/u(..)/g,"$1%")))

Jun 15 2019 3:53 PM UTC

}// 137/140

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All these balls are grey! #OpticalIllusion

u/KilledByAPixel

Apparently this is called a 2 color confetti illusion with circles
u/DataMeta

#hiddengem
u/KilledByAPixel

#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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metamero

remix of d/14453 by u/metamero

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱮𭀽𘠳𜠰𬁸𘁁𬡩𨑬𘁂𫁡𨱫𘠬𩡩𫁬𤱴𮑬𩐽𚁩👦𬡡𫑥𛐱𚐿𪐾𜰿𘠣𜁆𡠢𞠢𘰰𜀰𘠺𘠣𜀰𡠢𛁩𙠦𪐼𝀿𪑞𜰿𩡩𫁬𥁥𮁴𚁩𧠱🰢𩱲𩑥𫠢𞠢𪑬𫁵𬱯𬡹𘠬𞐹𛁩𚠴𜠰𚐺𬡯𭁡𭁥𚀮𝰸𝐩𞡦𪑬𫁒𩑣𭀨𪐪𜠳𛐹𞐬𛐲𩐳𛁩🰱𜰺𜡥𜰬𝁥𜰩𞱯𫡣𫁩𨱫👲𩑳𩑴`.replace(/u../g,'')))

Jun 6 2019 1:28 PM UTC

}// 140/140

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animated version of d/14453 click to reset

u/metamero

#illusion #opticalillusion behind the scenes ;)
u/DataMeta

#hiddengem

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pavel

function u(t) {

with(x)for(i=4;i--;fill())for(beginPath(j=4),fillStyle=i?R(a=128+50*S(~i%3+13*t),a,a):'#868';a=j--/.64;)arc(960,536-~i%3*5,i<3?300:3e3,a,a)

Jun 6 2019 4:36 AM UTC

}// 139/140

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The Perpetual Diamond #illusion

Show more comments…
u/pavel

Contrast Reversals Along Thin Edges Create the Appearance of Motion in Objects
u/pavel

https://doi.org/10.1177/2041669518815708
u/katkip

Wow
u/metamero

beautiful!!! #opticalillusion
u/SMON

It's grest but cannot hold a candle to some of your other works. :)
u/agshapiro

love it!

dwitter.net | #illusion