How can you make a 'paper spiral' spin without touching it?
What to do?
1. Cut out the spiral lines according to the pattern provided.
2. Stick the pin right through the rubber-end of the pencil.
3. Mount the pencil at the top of your table lamp with the pins facing upwards.
4. Place the bottle cap on the pin and witness this spiral illusion take shape.
What's going on?
Everyone knows that hot air rises. The lamp produces a current of hot air. As this hot air rises, it makes the 'paper spiral' spin.