There’s a story by Jorge Luis Borges called “Funes the Memorious” about a man who remembers everything, but can’t generalize. There’s a line about him not knowing if a dog on the square glimpsed at noon from the side is the same dog as the one seen from the back at 12:01 or something like that. Swirls of smoke from a cigarette are memorized forever. He mostly sits in a dark room.