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.

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Current theme challenge: #ScaryMovies

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KilledByAPixel

function u(t) {

for(t*=b=540,i=3e3;j=i--/470;x.fillRect(960+t*S(j),b+t*C(j),9,9))a=(i/64+(t>>6)|0)%2,x.fillStyle=t%64<9?a^t>b?R():'#fff':R(b*!a,t/5,b*a)

Oct 2 2020 6:44 PM UTC

}// 136/140

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False Motion Optical Illusion 👁️👁️

u/KilledByAPixel

#illusion

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anotherkitten

function u(t) {

for(i=15;--i;x.fill(p=new Path2D(),p.arc(960,540,V*100,0,8)))x.fillStyle=`hsla(270,40%,${25*S((V=i-t%1)-t)+50}%`

Sep 24 2020 3:15 PM UTC

}// 112/140

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if you stare at the center, the white rings move slowly; if you stare at the white rings, they move quickly #illusion

u/MAxSaL

I found it to be the opposite?
u/anotherkitten

huh, interesting

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smtsjhr

function u(t) {

eval(unescape(escape`𩡯𬠨𪠽𝀻𪠭𛐻𚑻𩡯𬠨𪐽𞐶𞱩𛐭𞱸𛡦𪑬𫀨𚐩𮱵🐨𩀽𚁩𚰨𚀭𜐩𚠪𪠩𚡴𙐲𚐯𜐵𚐥𜐻𪰽𣑡𭁨𛡦𫁯𫱲𚁤𚐻𮀮𩡩𫁬𤱴𮑬𩐽𤠨𨰽𪐥𜠪𜠵𝐬𨰬𨰬𜐩𞱸𛡢𩑧𪑮𤁡𭁨𚀩𞱸𛡡𬡣𚀨𜠪𪰭𜐭𠰨𨐽𚀭𜐩𚠪𪰪𭐪𜰮𜐴𚐩𚠨𠐽𜠰𜀩𛀲𚡁𚠨𜰭𪠩𚱓𚁡𚐪𠐬𠐬𜀬𝰩𯑽`.replace(/u../g,'')))

Aug 5 2020 4:42 AM UTC

}// 140/140

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SOURCE (194/140): for(j=4;j--;){for(i=96;i--;x.fill()){u=(d=(i+((-1)**j)*t%2)/15)%1;k=Math.floor(d);x.fillStyle=R(c=i%2*255,c,c,1);x.beginPath();x.arc((2*k-1-C(a=(-1)**k*u*3.14))*(A=200),2*A*(3-j)+S(a)*A,A,0,7)}}

u/Billedluh

This is perfect good job
u/smtsjhr

thx Billedluh! : )
u/joeytwiddle

#illusion #opticalillusion
u/Qwitter

fantastic!

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KilledByAPixel

remix of d/18160 by u/rodrigo.siqueira

function u(t) {

for(c.width&=j=3e3;j--;x.lineTo(448+S(a=i*.209+t*9)*r,600+C(a)*r/2-i))i=(j/4+(j%4!=2)*60|0)-t%1*40,r=i**3/2e5
x.stroke()

Apr 6 2020 10:04 PM UTC

}// 120/140

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#Vortex

u/ivylab

I have been waiting for the view to zoom out more for a minute. But it's seriously continuous! Amazing
u/KilledByAPixel

Thank you, it was tricky to get this one right.
u/KilledByAPixel

#illusion

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katkip

function u(t) {

c.width=700;for(i=999;i--;)s=99+S(i*.00157)*i/20*S(i%2+2.6)+S(i**9/9e24/6)*.01*i,x.fillText((i*t)&1,350+C(i*(q=.0062)+t)*s,200+S(i*q+t)*s)

Mar 12 2020 6:27 PM UTC

}// 138/140

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Binary Jörmungandr #ouroboros - XaTuring's physical form

u/katkip

#illusion : doesn't get smaller and smaller but that's the effect if you stare at it
u/joeytwiddle

Mmm delicious: me!

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yonatan

function u(t) {

c.width=-1
for(i=800;i--;x.beginPath(x.stroke()))x.ellipse(150,85+C(m=i)*50,r=69+50*S(m=i),r/3,0,t,9+t),x.setLineDash([r/9])

Mar 11 2020 11:12 AM UTC

}// 124/140

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u/13thptr

#torus #illusion

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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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rodrigo.siqueira

remix of d/17426 by u/rodrigo.siqueira

function u(t) {

for(i=880;i--;x.fillStyle=R(Y/2.5-r/(350+S(t*2)*300),0,r/2000,.8))x.fillRect(X=S(r=i*i)*i*3+i*C(t*3)+900,Y=C(r)*i+390+S(t*2)*i/3,i,i)

Jan 31 2020 6:05 PM UTC

}// 133/140

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Underwater lava cave #perspective

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u/tomxor

I keep switching perception between cave and mountain top, it gets stuck on mountain top... i can't control it 😳
u/sigveseb

I don't see mountain top 🤔 how?!
u/tomxor

funny, i can't see anything else now... it;s like looking down from above a mountain peak. Maybe imagine you are looking down from a circling helicopter.
u/rodrigo.siqueira

This #illusion is called "bistable perception". When I posted it was looking like a cave, now it seems to keep changing between mountain top and cave. I prefer a cave.
u/sigveseb

yes, I see it now!
u/rodrigo.siqueira

#tunnel
u/joeytwiddle

To see the mountaintop, maybe look at the blue and imagine it is the floor or the sea, far away.

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KilledByAPixel

function u(t) {

for(c.width=k=800;k--;x.fillText('⬤',X-(q=3+S(Math.hypot(393-X,227-Y)/99-t)**3*49)*S(t*6),Y+q*C(t*6)))j=k%23,X=k*1.1+j%2*13-49,Y=j*26-49

Jan 27 2020 11:45 PM UTC

}// 136/140

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🐝💣 https://twitter.com/beesandbombs/status/1205…

u/katkip

#illusion #Beesandbombs

dwitter.net | #Illusion