This page from Hyperphysics contains images depicting the light emitted by several elements and their respective spectra. The page also provides a description of how the size of a holographic image scales with the...

This Exploratorium site contains an activity about afterimages, the lingering images seen after staring at a particular stimulus. Participants look at bird shapes of different colors for a while and then look away,...

This website from eChalk contains optical illusions offering proof that our color perception is strongly influenced by surrounding colors. The site also includes educational games related to optical illusions and color.

This activity demonstrates the additive properties of light. Different-colored lights are shown on the same spot on a screen so that the reflecting light is white. Colored shadows, however, can be made by holding an...

This is a 1:09 minute long YouTube video of a LEGO Mindstorms NXT robot that was programmed to solve a Rubik's Cube puzzle. Anyone interested in computer programming, computer engineering, robotics, and/or machine color...