let w = 24;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(0);

  translate(width/2, height/2);

  rectMode(CENTER);

  let offset = 0;

  //making the x different fromthe width here looks cool!

  for(let x = -width/2 + 10; x < width/2; x+=2){

    let a  = angle + offset;

  let h = map(sin(a), -1, 1, 0, 300);

  fill(255);

  rect(x,0,w-1,h);

  offset+=0.1;

  }

  angle += 0.01;

}