The potions master sits in his office, checking his students' homework. Professor Snape's office was gloomy, dimly-lit, and a bit chilly as it was located in the school dungeons. The shadowy walls were lined with shelves of large glass jars filled with slimy, revolting things floating in potions of various colours. Professor Snape was seated at his desk, eyebrows scrunched in frustration as he graded assignments.