Light Mixing Exhibit at the Exploratorium SF

This is one of my favorite exhibits at the Exploratorium in San Francisco. This is something I want to experiment with myself at my next house party. They use a red, green, and blue light to create white light. When an object stands in front of the light projected it blocks one, two or all of the lights from hitting the wall behind leaving both the primary and the secondary light colors to be shown. This is a cool and fun way to show color mixing with lights.