createCanvas(500, 500);

  colorMode(HSB);

}

​

function draw() {

  background(250);

  noStroke();

  for (let i = 10; i < 490; i += 10) {

    for (let j = 10; j < 490; j += 10) {

      fill((i+j)%360, 100, 100);

      circle(sin(i*frameCount*0.00001)*500, cos(j*frameCount*0.00001)*500, 50*cos(i));

    }

  }

}

​