So many a door and so many a chore are found on this, the second floor. Between the Arithmancy classroom and the Headmistress' Office are several doors and thiiiiiings so... what's not to explore on this legendary floor?

Oddly enough, you'll notice that this floor and staircase are, in particular, cleaner than the others on other floors. Could it be because the Headmistress brought along her own personal House Elf this term? Maaaaaaybe...