Medieval Art I is a fairly interesting class, but Mateusz is simply one of the worst TAs you can ask for. He takes everything too seriously, is a harsh grader, and if you miss a section, he creates ridiculous requirements to make it up. Never before in the art history department has there been a TA who takes themselves this seriously. Not to mention, he doesn't even really know about medieval art, so him TA'ing for Professor Holger Klein is kind of a joke (and it shows in sections.) Do yourself a favor and avoid him at all costs.