How are Optical illusions used?
Entarsis: “Primitive” man used it when he built Stonehenge to make the stones look taller. Perspective: “Primitive” man used it to create a sense of distance in cave paintings. Op-Art Popular in the 1960’s drug culture to create the illusion of movement in poster type pictures. Door mirrors on vehicles: Left and right mirrors differ both in curvature and focus to give informative overall views to a driver.
