I’ve heard #bitcoin described as boxes, each with a key (or keys) to allow the owner to transfer or repack the contents. I think this analogy is pretty good, but I’d add another critical piece which is location. Imagining Bitcoin as boxes immediately leads one to think of a vault of deposit boxes at a bank. It’s better to think of the boxes as distributed throughout the universe. There are 2^256 (10^77) possible private keys, about the same number as atoms in the universe. It’s amazing to think that one can effectively stash their wealth in the combinatoric equivalent of a single atom in our vast universe.