https://warburg.sas.ac.uk/archive/archive-collections/verkn%C3%BCpfungszwang-exhibition/mnemosyne-materials

Knowing about Aby Warburg's zettelkasten use, I'd noticed that the Mnemosyne Atlas looked suspiciously like a visual version of a zettelkasten, but with images instead of index cards or slips. Apparently I'm not the first...