Prepare materials and tools: a piece of cardboard, two paper cups, red, black, white One color pen each, double-sided tape, a utility knife, and scissors.
1. Cut the cardboard into triangles.
2. Cut a paper cup into the shape in the picture.
3. Paint the cut paper cups, complete paper cups and cardboard red.
4. Draw a pattern on the surface of the paper cup, make an opening at the bottom edge, and clamp the cardboard at the opening.
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5. Glue the cut paper cup to the inside of the complete paper cup.
