@tqft @mina
Adding to that (in the rare case not everyone remembered “Banach-Tarski" at once):

You actually can, mathematically proven, divide an object into (very) many (very) tiny pieces, reassemble them and – get two objects, each with the size as the initial one.

Caveat: Really many, really tiny pieces with really peculiar geometry required.
😀

https://en.wikipedia.org/wiki/Banach%E2%80%93Tarski_paradox