The WebExibit Color Vision & Art is an excellent source for this class. It provides an exploration of the simultaneous emergence of modern art and scientific studies of perception. The interactive demos are particularly helpful.
Bruce MacEvoy's Color Vision site gives a comprehensive overview of color vision theory for painters.
The web tutorial The Bases of Color Vision composed by Brian Thomas Wagner and Donald Kline of the University of Calgary is another excellent source of color analysis. This site is particularly strong on the neurophysiology.
Simultaneous Contrast Effects: Adelson's Flash Demos of brightness contrast effects. We viewed these images in class 3.
Gestalt-Bauhaus-Form
Albers Foundation Site: We looked at this briefly in class 3. It's a helpful site for the color contrast assignment.
Bauhaus Archiv Museum of Design
Oskar Schlemmer's Theatre Look at the section on Schlemmer & the Bauhaus
Magni-Phi: Filip Pizlo's stunning modern demonstration of the motion effect that launched the Gestalt revolution in 1912.
Optical Art/Illusionism
The Grandfathers and Influences section of Ronald Davis's Abstract Art site