Coloured Shadows

What would happen if your shadow, which is always grey, suddenly showed itself in colour? This experiment consists of three spotlights of different colours.

Place your hand in front of the light source and observe its shadow. Shadows are normally black or grey. The experiment consists of three coloured lamps: red, green and blue. Where your hand covers the red lamp a cyan shadow forms on the screen. Where your hand covers the green lamp the shadow is violet, and where your hand covers the blue lamp the shadow is yellow.

This way of mixing colours is known as "additive", since you are adding the colours to each other. All colours when added together make white light.