IllusionWorks - A multimedia museum of optical and sensory illusions, with on-line demonstrations and explanations. The Noh Mask Effect - Demonstrates illusory facial expression perception with Japanese Noh masks. Links to publications about the effect. The Moon Illusion Explained - A relatively new theory is offered for the classic illusion that the moon's constant subtended visual angle of half a degree appears larger for the horizon moon than for the zenith moon. Mind Hacks - Neuroscience and psychology tricks discussed and perhaps explained. Companion site to the "Mind Hacks" book by Tom Stafford and Matt Webb. The Manifold of Sense - A survey of the discourse regarding emotions, sensations, and an attempt at producing an integrative approach to sensation and perception. Mind Bluff - A family-friendly collection of tactile illusions, mental deceptions, optical tricks, brain puzzlers, and feeling games to play on the self. Sensation and Perception Tutorials - A small collection of tutorials and demonstrations in sensation and perception. The Poggendorff Illusion - A study attributing the illusion to summed effects of cardinal axes in the observer's field of view and of salient axes in the figures. Neuhoff, John - Auditory Perception Research - Electronic reprints of relevant publications on pitch, loudness, localization, and auditory display. (College of Wooster, USA) Some Visual Illusions - This site shows a range of common visual illusions along with a brief explanation of why they occur. It was originally prepared to show at a children's primary school as part of their study of sensory processing. Optical Illusions by Psych ARTS - We think we perceive objective reality, but perception is always altered by invisible biases. We are never free of the state-dependent bias, and so we are continually taken in by an illusion. The Blanking Phenomenon and its Psychoanatomical Implications - J J McAnany and M W Levine of the Department of Psychology, University of Illinois at Chicago provides information on this visual illusion. Visual Science Group: University of Helsinki - Research at the Department of Psychology, is focused on human visual processing using psychophysical methods. VisualIllusion.net - Matthew Luckiesh's book of this title, published in 1922, was the first scientific explanation of optical illusions to be published.