You will need:

- Coloured pens, or a colour printer, plus paper.

- 1 Nail, pencil, cardboard and glue.

Instructions

1. Print the picture shown or make your own on paper.

2. Glue the picture on some cardboard and allow to dry.

3. Piece the middle of the disc with a nail.

4. Insert the pencil through the whole and spin the disc.

5. What colour do you see?