lines

function setup() {
  var canvas = createCanvas(500, 500);
  canvas.parent('sketch');
  colorMode(HSB);
}

function draw() {
  background(98);

  for (var y = 0; y <= height; y += 5) {
    stroke(30);
    strokeWeight(2);
    line(0, y, width, y);
  }

  noStroke();
  fill(100);
  rectMode(CENTER);
  rect(width / 2, height / 2, width / 3, height / 3);
}