EdT "No matter how thin you slice it, there will always be two sides."
― Baruch Spinoza

Three, actually, if it's a circular or elliptical item. More otherwise.

I well remember asking my Physics teacher during a test if we should write on both sides of the paper to receive the pearl: "Naylor, you can write on all 6 sides if you like, but I can't promise to mark it all"