There is a theory in architecture called the "sky exposure plane" – a zoning rule that determines how much sky a building is allowed to block. It exists to protect light and air for people on the ground. The irony is that looking up at the result, the buildings and the sky they were meant to leave room for become the same composition.

From street level, a building is a facade. From directly below, it becomes something closer to sculpture – or a problem in geometry.