You explain that these cards will actually respond to magnetic fields in the same way a compass does. A magnet is placed on the table and suddenly the arrows change direction! This is repeated again and again...each time it appears more impossible than the last! Finally you offer to demonstrate the dangers of getting a compass too close to a magnet and one of the arrows becomes irreversibly twisted!

Includes brightly colored laminated cards and magnet. Uses just three cards, nothing is ditched or added!