def setup
  createCanvas(100, 100, WEBGL)
  ortho(-width / 2, width / 2, height / 2, -height / 2, 0, 500)
end

def draw
  background(200)
  # orbitControl
  normalMaterial

  rotateX(0.2)
  rotateY(-0.2)
  push do
    translate(-15, 0, sin(frameCount / 30) * 65)
    box(30)
  end
  push do
    translate(15, 0, sin(frameCount / 30 + PI) * 65)
    box(30)
  end
end