It's at 16:41 that things are deeply interesting. This is the classical notching with the undulating sine wave surface. The way this is structured allows me to make the same exercises with SHELVES!!! and drawers. A three by one suffice for those who are interested in extending the idea. Then graft up all those list items if you want to generalize. Even particular shelves can be altered in those pattern lists. This exercise alone has four techniques used for buildings levels, facades, surface manipulation and space partitioning.