It s the only one of its kind in Denmark and is used in advertising and other businesses. You see apparently two identical living rooms. However, a hatch in the roof reveals a holographic trick. The numerous colours seen in a TV picture are formed by only three colours. The colours of the test card can be studied through a magnifying glass or by turning off one or a number of the TVs colour canons.
Most people only remember prisms as small pieces of glass from physics class.
This prism is a meter high aquarium. It still separates the light's colors.