The colors of the font are to be recited in turn. Concentration is needed; most people are more likely to read the text instead of naming the colors independently of the word.
Here, white and blue/green/red light is pointed at a white surface. If you hold your hand a few centimetres over the surface, it casts two shadows on it - one of each lamp. Astonishingly, a purple shimmering shadow appears where the light of the green lamp is shielded, but the white light still shines! The blue-white lamp combination provides a yellow shadow.
This exhibit is given either a color combination or a sequence. The visitor tries to memorize them and then reproduce them via the color buttons. After the selected challenge (5 different difficulty levels are available), either the buttons in the same positions or the buttons with the same colors must be pressed in the correct order.