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a "hands-on" demonstration of Additive Color Theory

There are 3 beams of light (Red, Green, Blue) projected onto a white wall in a darkenend room creating 3 sets of shadows.
These are the Additive Primaries of color. The visual combination, the background here, is perceived as White.
Any object blocking the path of any of the lights, like the hands above, will create various shadows.
Where all 3 shadows overlap, no light passes through and that region appears black.
Where the Blue light alone is blocked, the other two colored beams (Red and Green) remain and overlap.
They ADD to each other and combine to make Yellow. Where Red and Blue lights combine (and add together) they create Magenta.
The Blue and Green lights combine to create the Cyan.