How to make a small guzheng with rubber bands?

Tools: empty box with cover, cardboard, 8 rubber bands, scissors.

Operating steps:

1. Cut the cardboard into a right triangle with scissors.

2. Cut 7 notches at equal distance on the hypotenuse of the right triangle.

3. Fix the right-angled triangular cardboard with a rubber band, with the right-angled face down and the hypotenuse up. Every rubber band has a gap, and the distance between rubber bands should be evenly distributed as far as possible.

4. The experiment was successful, and a unique guzheng was made.