This is a simple regular grid tessellation; the tiles are either a twinkling star or a moon in one of its phases from full to almost new. A coin-toss algorithm is employed to decide on which shape is drawn. If the star is chosen then controlled randomness determines a star’s inner radius, the outer radius being fixed. That is as close as I could get to making a star twinkle. Then I rotate the star some random angle. If the moon is chosen, then controlled randomness determines the phase from full to almost new and some degree of rotation. One-twenty-eighth of the time no moon is drawn representing the new moon phase. The larger the overall image, is the more it represents the night sky.