Who: anyone Where: all over When: Day 108, early morning. What:
When you wake up today, there's a good chance there's something new outside, somewhere. A quote, in any number of places: sketched on your door in charcoal. Drawn in the dirt of your common area. Written by the showers in rocks, arranged by the lake in bones. A shelf in the library, rearranged by the title to spell out something.
If you look nearby, you can probably find the culprit. It's not like he's trying to hide.