You too can make your very own genuine Escher cutlery....

Ok, it does sound like a cheesy advert. However, someone here might like this visual gag of mine, which up to now I have not found the right place to share it. Should work here though, I hope. If you know how to perform Hot Rod, Drop Out, or the miriad of similar effects where you are up a creek without a certain move, read on.

Take an item of cutlery, and do the necessary action with it.

And there you have it: Escher's spoon - concave on both sides

Enjoy!