You will need:
1. Print the picture shown or make your own on paper.
2. Glue the picture on some cardboard and allow to dry.
3. Pierce the middle of the disc with a nail.
4. Insert the pencil through the whole and spin the disc.
How to teach science, the way primary kids love
5. Do you see any colours on the disk?
6. Slow the disk to 3 - 5 rotations/sec and dim the light.