dwitter.net | #Illusion

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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.
Theme challenge of the month: #pumpkin
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  • False Motion Optical Illusion 👁️👁️

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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

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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)}}

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  • Binary Jörmungandr #ouroboros - XaTuring's physical form

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  • Colored lights

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  • 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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  • 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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