The elevator company may just have thought, that scientist language is English. On an English keyboard the ground floor may be the “1st floor” – usually, in some other countries. Would be no problem, just start counting with one. But when the company who painted the staircase is German, they start with the ground floor (Erdgeschoss) followed by the “first floor” or “Level 1″. The elevator, quite often, spits out some disoriented guests. Stickers came there to help, but still there seems to be enough confusion.
This post is also available in deutsch.