MarcAbrahams, 
Chung To Kong found a way, in the spirit of unboiling an egg, to make banknotes from shredded banknote pieces.... [And other stuff, too. My col this week in New Scientist] https://www.newscientist.com/article/mg26234891-500-how-to-make-138000-from-shredded-banknotes-if-youre-in-hong-kong/