Required materials: white cardboard, black cardboard, orange cardboard, plastic bag, watercolor pen.

1. Cut out the shape of a flashlight with orange cardboard.

2. Cut out the beam shape with white cardboard.

3. Stick two pieces of cardboard together with double-sided tape to make a flashlight.

Draw a pattern on the plastic bag with a watercolor pen.

5. Put the black cardboard into the plastic bag.

6. Put the flashlight in a plastic bag to illuminate the hidden pattern.