On the south side of the Craig lecture hall, this interior passageway leads to the Wright building.  The portion of Wright that you see here used to be an exterior wall but is now indoors.  Unfortunately, Wright was designed like a split-level house — from the ground-level entrances, you have to go either up a few feet to the first floor or down a few feet to the basement — so its floor levels don't match up with the new construction.  Stairs are required.