A piece of rainbow in glass, decorative item and experiment

When the sun shines on a prism, the light is refracted. On the opposite wall you can see A PIECE OF RAINBOW moving through the room against the movement of the sun. If you hold the prism in front of your eyes, colored edges appear at every transition between light and dark. The real glass breaks the light better, there are brighter and more intense colors. For joy at any age, even in the study or sick room.