1. Tie three mirror strips into a triangle with the mirrors facing inward.

2. Push the prism into the prepared plastic wrapping tube.

3. Cut out 3 pieces of frosted glass according to the size of the plastic wrap tube.

4. Put two frosted glasses at both ends of the barrel and fix them with glue.

5. Put the prepared colored beads into the lens barrel, and then seal the mouth with the last piece of frosted glass.

6. Wrap the paper tube with colored wrapping paper.