let y = 0;

let size = 20;

let size2 = size * 2;

let sizeD2 = size / 2;

let size1_5 = size * 1.5;

​

function setup() {

  createCanvas(400, 400);

  background(40, 12, 20);

  strokeWeight(2);

}

​

function draw() {

  let r = random();

  stroke(r * 255, 0, 255 - r * 125);

  if (r < 0.5) {

    line(x, y, x + size, y + sizeD2);

    line(x, y + size, x + size, y + sizeD2);

    line(x + size, y + size1_5, x + size, y + sizeD2);

  } else {

    line(x, y + sizeD2, x + size, y);

    line(x, y + sizeD2, x + size, y + size);

    line(x + size, y + size1_5, x + size, y + sizeD2);

    line(x, y + size1_5, x, y + sizeD2);

  }

  x += size;

  if (x > width) {

    x = 0;

    y += size1_5;

    if (y > height)

      noLoop();

  }

}