Pinball Machines - Aliens, Killer Spaceships and Cosmic Abominations!
While Space Invaders is a blatant rip off of H.R Giger's alien design, it goes further by copying much of Giger's biomechanical designs from his paintings. Interestingly, the biomechanical style kind of looks like it was originally intended for pinball machines. It really works great in the design of the machine. I'm really curious what Giger might have come up with if he'd designed his own pinball games.