Not an Occulus

This is a spectacular oval window in the George Eastman House.  In my earlier photograph of the stairway, you can see an oval opening at the top of the stairs.  If you go to the second floor and look up this is what you see - a balustrade on the third floor, and above that a magnificent oval window.  I wasn't sure what this kind of oval window was called.  I thought it might be an "occulus" but when I looked that term up, the window needed to be round.  So this is just an oval window, I guess.  Anyhow, this is a beautiful thing to see.