Someone should photograph the ones at ETH Zurich. Floors are labelled alphabetically, except that the ground floor is E (presumably for German Eingang = entranc

Someone should photograph the ones at ETH Zurich. Floors are labelled alphabetically, except that the ground floor is E (presumably for German Eingang = entrance). But for the ones on the hillside, how do you handle negative letters when you go below A (since the E floor lines up with the entrance on the top)? Answer: not just Z, Y, X ... but also weird things like ZZ for mezzanines.