A jolly pinwheel you can bring out on any windy day and watch it spin!
Cut a rather stiff piece of paper about four inches square and cut it on the dotted lines as shown in the little diagram.
Lines number 1, 2, 3 and 4 should be folded over in their order to the center point, number 5.
Push a pin in the center.
When it's folded over, pin it on the end of a round stick or pencil and run against the wind.