This colorful, interactive Web site provides a lively introduction to the nature of light and spectra. A product of Project LITE (Light Inquiry Through Experiments) at Boston University, the site offers a variety of applets, activities, and materials on topics ranging from color mixing and afterimage effects to moire patterns and geometrical optics. A fascinating section on visual effects and illusions requires a Flash plug-in.

Go to: http://lite.bu.edu/