Excuse my ignorance on this but...
Whilst surfing Her Majesty's Internet the other day I came across a bill change (i think thats what its called!) Where an English note was held in both hands and then folded up and then unfolded into a different note. Again excuse my ignorance but could any of you chaps point me in the right direction to learn the effect (book or dvd). I can't find the video that i saw it in.

Many thanks...