This class is a gem.  Rabbi Paltiel walks you through the layers of commentary on the Aron Hakodesh (the Holy Ark) from the simple to the complex.  This is an unusual opportunity to see the differences between Philosophy, Kabbala, and Chassidus clearly applied to a concrete example.  Sources include: Rashi, Even Ezra, Ramban, Rabbenu Bechaye, Ralbag, Rambam, and a sicha from the Lubavitcher Rebbe (volume 26, p.175).