Philosophers spent two thousand years on the Ship of Theseus: replace every plank one by one, is it still the same ship? A programmer heard the question, ran the planks through a hash function, and said "no, it's a different ship, here's the receipt, can we go to lunch."

Turns out the riddle was only hard because everyone insisted the answer had to be profound. Ask "the same in what sense, and who's asking" and it stops being philosophy and becomes inventory.