​

function setup() {

  createCanvas(500, 500);

}

​

function draw() {

  background(0);

  // Use a loop to create multiple rectangles

  for (let x = 0; x < width; x += 20) {

    let h = map(sin(angle + x * 0.01), -1, 1, 0, 100);

    fill(255);

    rect(x, height / 2 - h / 2, 10, h);

  }

  angle += 0.1;

}

​