I remember first learning about optical illusions from “Light and Vision” one of the amazing Time Life Science Library set of 26 books published in the mid-1960s. I was also fascinated by “The Planets”, “Flight”, and “Mathematics”.

An artist named Akiyoshi Kitaoka has produced some amazing art/illusions. For example, take the image below. There’s no trickery involved, it’s just a static JPG image. Absolutely amazing.