They also teach us about our visual perception, and its limitations. My selection emphazises beauty and interactive experiments; I also attempt explanations of the underlying visual mechanisms where possible. Returning visitor? Rather, I view these phenomena as highlighting particular good adaptations of our visual system to its experience with standard viewing situations. If you are not a vision scientist, you might find my explanations too highbrow. That is not on purpose, but vision research simply is not trivial, like any science.
10 Cool Optical Illusions to Try
An optical illusion also called a visual illusion  is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. Illusions come in a wide variety; their categorization is difficult because the underlying cause is often not clear  but a classification   proposed by Richard Gregory is useful as an orientation. According to that, there are three main classes: physical, physiological, and cognitive illusions, and in each class there are four kinds: Ambiguities, distortions, paradoxes, and fictions. Pathological visual illusions arise from pathological changes in the physiological visual perception mechanisms causing the aforementioned types of illusions; they are discussed e. Optical illusions, as well as multi-sensory illusions involving visual perception, can also be used in the monitoring and rehabilitation of some psychological disorders, including phantom limb syndrome  and schizophrenia. A familiar phenomenon and example for a physical visual illusion is when mountains appear to be much nearer in clear weather with low humidity Foehn than they are.
143 Optical Illusions & Visual Phenomena
Subscriber Account active since. In the past few years, the internet has given us The Dress , a photo of a mysterious missing leg , and this disorienting floor design. Michelle Dickinson , a nanotech engineer, posted the optical illusion on Twitter in January In the video, Kemakolam starts by holding her left hand up to the camera, with her open palm facing the camera. After that, she wraps the fingers of her right hand around the palm of her left hand.