Upstairs

function setup() {

  createCanvas(windowWidth, windowHeight, WEBGL)

}

​

function draw() {

  background(color(255, 255, 255))

  rotateY(frameCount * -0.025)

  directionalLight(color(255, 255, 255), 0, 0, -1)

  pointLight(color(168, 0, 0), 0, 0, 1000)

  box(10, 1000, 10)

  translate(0, 400, 0)

  for (let i = 16; i--;) {

    push()

      translate(200, 0, 0)

      box(550, 10, 50)

      translate(250, 600, 0)

      noStroke()

      box(50, 1200, 50)

    pop()

    translate(0, -50, 0)

    rotateY(PI / 16)

  }

}