Optical illusion devices are tools or equipment designed to create visual phenomena that deceive the human eye’s perception of reality. These devices exploit the brain’s interpretation mechanisms, leading to a perceived image that differs from objective reality. Central to these devices are principles from cognitive psychology, neurobiology, and optical physics. Examples include the stereoscope, which presents two slightly different images to each eye to simulate depth perception, and the zoetrope, creating the illusion of motion through rapid sequence imagery. Optical illusion devices have been around for centuries, serving both entertainment and scientific purposes. They played a pivotal role in developing early film and animation techniques and continue to shape virtual reality technologies today. Their study provides insightful understanding into human vision and perceptual processes.