​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(0);

  let size1 = map(sin(radians(angle)), -1, 1, 0, 100);

  ellipse(100, 100, size1, size1);

​

  let size2 = map(sin(radians(angle - 1 * (360/4))), -1, 1, 0, 100);

  ellipse(300, 100, size2, size2);

​

  let size3 = map(sin(radians(angle - 2 * (360/4))), -1, 1, 0, 100);

  ellipse(300, 300, size3, size3);

​

  let size4 = map(sin(radians(angle - 3 * (360/4))), -1, 1, 0, 100);

  ellipse(100, 300, size4, size4);

  angle = angle + 1;

}