Prepare materials and tools: one Straw, a table tennis ball, a roll of paper, a jelly box, a watercolor pen, a high nail, scissors< /p>
1. Cut the table tennis ball from the middle.
2. Thread half of the table tennis ball with three threads, and then tie it to one end of the straw.
3. Tie the other half of the ping pong ball to the other end of the straw.
4. Punch a round hole at the bottom of the jelly box.
5. Insert the watercolor pen into the round hole of the jelly box.
6. Use high nails to fix the straw on the top of the watercolor pen.
