Akiyoshi KITAOKA, born in Japan in 1961 is an Associate Professor of Psychology at the Department of Psychology, College of Letters, Ritsumeikan University, Kyoto, Japan. He received B.Sc. from the Department of Biology, University of Tsukuba, Tsukuba, Japan in 1984, and received Ph.D. (Doctor of Education) from the Institute of Psychology, University of Tsukuba in 1991. He has studied visual illusion extensively including geometrical illusions, lightness illusions, color illusions, motion illusions and so on. Before starting to investigate visual illusions, he had studied animal psychology, specializing in various subjects such as burrowing behavior in rats at the University of Tsukuba, and neurophysiology on inferotemporal cortex of monkeys at the Tokyo Metropolitan Institute for Neuroscience. He has constantly kept updating the collection of his illusion designs on his website since 2002.