​

function setup() {

  createCanvas(canvasSideLen, canvasSideLen);

  background(100)

  stroke(0)

  fill(255,0,0)

  colorMode(HSB);

  let sLen = canvasSideLen/2;

  let place = 0;

  let place2 = 200;

​

  for (let i = 0; i < 9; i++) {

  fill(112,50,255);

  rect(place, place, sLen, sLen);

  fill(23,50,255);

  rect(place2, place, sLen, sLen);

  fill(245,50,255);

  rect(place, place2 , sLen, sLen);

  place += sLen;

  sLen /= 2;

  place2 += sLen;

  }

​

}

​