Turn on the laser by touching the metal plate.
Turn the levers for red, green and blue light to maximum brightness, and white to minimum brightness.
Place your hand underneath the white screen
Which colours do you see around your hand?
Also try
Adjust the lever for red and green to zero. Adjust blue and white to maximum brightness. Place one finger underneath the white screen. Adjust the white light so that you get a bright yellow shadow.
What makes the yellow colour?
Try using white and green, or white and red light. What shadows do you see?
Fun facts
Where the hand shade all the three light-colours the shadow becomes black. The areas where the hand shades two colours the shadow will get the primary colours, and the area where it shades one of the primary colours the shadow will consist of secondary colours
When you illuminate one finger with white and blue light you will get a blue and a yellow shadow. The yellow colour originates from your own brain. The shadow is actually grey.