Sonya Kovalevsky describes a childhood story as a nine year old in 1860 Russia where her father completed her bedroom wallpaper with a professor's math notes. This is an excerpt of her story:       These sheets, spotted over with strange, incomprehensible formulæ, soon attracted my attention. I remember how, in my childhood, I passed whole hours before that mysterious wall, trying to decipher even a single phrase, and to discover the order in which the sheets ought to follow each other. By dint of prolonged and daily scrutiny, the external aspect of many among these formulæ was fairly engraved on my memory, and even the text left a deep trace on my brain, although at the moment of reading it was incomprehensible to me. Math sites      Explore Learning has a Visual Dictionary of Special Plane Curves, Wallpaper Groups (tilings, patterns, symmetry), and Graphics Gallery Xah's Home Page. A Visual Dictionary of Special Plane Curves, Wallpaper Groups (tilings, patterns, symmetry), and Graphics Gallery Acoustics and Vibration Animations by Dan Russell, Ph.D., Associate Professor of Applied Physics at Kettering University in Flint, MI. This site contains animations and visualizations of concepts concerning acoustics and vibration. The choice of animations coincides with topics covered in the courses PHYS-382, Acoustics I: Sounds and Sources, and PHYS-482, Acoustics II: Sound and Vibration. Visual Perception sites      www.yorku.ca/eye cns-web.bu.edu/pub/laliden/WWW/Visionary/Visionary.html psych.hanover.edu/Krantz/sen_tut.html http://www.psy.ed.ac.uk/people/jhender9/Lab dragon.uml.edu/psych/illusion.html

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