The Arrow That Flips in Water
An arrow drawn on paper turns around all by itself the moment you look at it through a glass of water. Sliding the paper closer flips it back, and somewhere in between it disappears.
What you need
- Clear glass
- Water
- Paper
- Thick pen or marker
How to play
- Draw a fat arrow pointing to the right on a piece of paper.
- Stand the paper up behind an empty glass and check that the arrow still points right.
- Fill the glass with water and look through it at the arrow again.
- Watch the arrow turn around and point the other way.
- Slide the paper slowly towards the glass until the arrow flips back.
- Draw a fish underneath and find the spot where it starts swimming the other way.
