You will need:

- A plastic file
- 2 sheets of copy paper
- A black alcohol-based felt tip pen
- Highlighter pens

Draw a rainbow and some clouds using the marker, and color them in. Place the piece of paper with the drawing inside the plastic file, and trace over the top of it with the marker directly onto the plastic file. Now insert the second, blank piece of paper over the top. All your child has to do is slide the top piece of paper in and out of the file, and the rainbow will go from black and white to colorful.