he cottage on top is a sculpture called "Fallen Star" by Do Ho Su

"A small cottage has been picked up, as if by some mysterious force, and “landed” atop Jacobs Hall, where it sits crookedly on one corner, cantilevered out over the ground seven stories below.
A lush roof garden of vines, flowers, and vegetables, frequented by birds and bees, is a small gathering place with panoramic views of the campus and beyond.
Upon entering the house it becomes apparent that the floor and the house itself are at different angles, causing a sense of dislocation – some would say vertigo.
One must adjust both physically and mentally in order to accommodate a whole new view of the world. The surroundings are familiar but the feeling is not."