recreated a tiny effect in python. for the lulz.

tilted-chessboard.py

import pyxel


class Intro:
    def __init__(self):
        pyxel.init(160, 120, caption="Greg was here")
        self.timer = 0
        pyxel.run(self.update, self.draw)

    def update(self):
        self.timer += 1

    def draw(self):
        for y in range(pyxel.height):
            for x in range(pyxel.width):
                magic = 0x21F

                # making sure we don't divide by zero.
                # also cropping the noisy top of the tilted checkerboard pattern
                yy = y + (magic >> 4)

                # seed for perspective distorsion by y axis
                a = magic // yy

                # centering x, adjusting pattern width
                cx = (x - pyxel.width // 2) * 5

                # generating checkerboard pattern, shifted by time
                t = (cx // yy) ^ (a - self.timer)

                # adjusting color for available color palette
                color = t & 0b1011

                pyxel.pset(x, y, color)


Intro()

Nice one dude! Very elegant solution, also looks cool with the retro resolution and colors :)