I was recently at an interactive installation that had three theater lights – red green and blue shining on a white wall.

The kids were fascinated by this – especially with how the colors mixed and how they could make different colors by casting shadows on the wall.

This is a human scale representation of the red-green-blue (RGB) additive color model (the electronic screen you are looking at right now uses the exact same method to reproduce every color you’re looking at).

It also reminded me of some of the really cool applications to use photography gels to have fun with color.

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