createCanvas(400, 400);

  // specify color in hue / saturation / brightness

  colorMode(HSB);

}

​

function draw() {

  background(255);

​

  let modulo1 = frameCount % 32;  // will go from 0 to 31

  fill(modulo1, 100, 100);

  ellipse(100, 200, modulo1, modulo1);

  let modulo2 = frameCount % 64;  // will go from 0 to 63

  fill(modulo2, 100, 100);

  ellipse(200, 200, modulo2, modulo2);

  let modulo3 = frameCount % 128; // will go from 0 to 127

  fill(modulo3, 100, 100);

  ellipse(300, 200, modulo3, modulo3);

}