The Piano Trick with Instructions
The Piano Trick
The Piano Trick  works well for schools, young people seem to really enjoy this. It is interactive therefore you will need a good supply of cards, 21 cards  per participant. It is self working and really easy to perform. When used for schools it is a good way to get the students thinking outside the square. You can ask your students if anybody can  fathom out the secret and explain it to the class.