I learned this trick from one of David Williamson's DVD and it is certainly a stunning trick. David
Williamson is an amazing magician and I'm sure you'll agree once you learn this trick. This trick is
based on mathematical principles but not like other math tricks which are easily figured out. After
learning this trick I recalled thinking that this was probably one of the best pieces of magic I
have ever seen. If you don't believe me, buy this and you will see for yourself.