dwitter.net | #opticalillusion

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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: #crypto
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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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  • 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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  • Dizzy Dots

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  • divibility!

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  • u/DataMeta
    The center of the base of the triangle doesn't exhibit the illusion strongly since there is a constant reference color near it and it is far from the changing background.
  • u/iverjo
    #opticalillusion

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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

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