Optical illusion There are a variety of different types of optical illusions. Many are included in the following list. Artists who have worked with optical illusions include M. C. Escher, Bridget Riley, Salvador Dalí, Giuseppe Arcimboldo, Patrick Bokanowski, Marcel Duchamp, Jasper Johns, Oscar Reutersvärd, Victor Vasarely and Charles Allan Gilbert. Contemporary artists who have experimented with illusions include Jonty Hurwitz, Sandro del Prete, Octavio Ocampo, Dick Termes, Shigeo Fukuda, Patrick Hughes, István Orosz, Rob Gonsalves, Gianni A. Sarcone, Ben Heine and Akiyoshi Kitaoka. Optical illusion is also used in film by the technique of forced perspective. Op art is a style of
Ponzo illusion not subject to the size illusion. In other words, the opening between the index finger and thumb is scaled to the real not the apparent size of the target object as the grasping hand approaches the object. Cross-cultural differences in susceptibility to the Ponzo illusion have been noted, with non-Western and rural people showing less susceptibility. Other recent research suggests that an individual's receptivity to this illusion, as well as the Ebbinghaus illusion, may be inversely correlated with the size of that individual's primary visual cortex. Ponzo illusion The Ponzo illusion is a geometrical-optical illusion that was first demonstrated by