1. Cut a table tennis ball in half, take half of it and set aside. Mix latex and fine sand and put it into the hemisphere. Let it dry and set aside.

2. Roll the cardboard into a cone shape and stick it firmly.

3. Fasten the bottom surface of the glued conical barrel to the cross section of the hemisphere.

4. Paint the pre-thought pattern on the outside of the glued work.

Materials: table tennis balls, latex, fine sand, hard paper.