The utility of all utilities!
Clearly show both sides of a blue cloth. Lift the four corners together making a loose bag. Place a borrowed watch or small object in this loose bag. Release your grip of the four corners and the cloth falls flat. The watch or object has vanished!
Or put an item inside the four folds and have a different object come out! Use for vanishes, productions or even changes! Use it to force slips of paper or playing cards, and so much more!
You’ll find lots of great uses for the Devil’s Napkin!