In a large, neoclassical building, this is a large circular opening in the ceiling, showing the floor above. Through it we can see the coffered ceiling, a wrought- iron hanging lantern, a door opening, and, in that opening, a small person looking over the railing.
This is a big hole (intentional) in the ceiling above the main entrance of the National Gallery of Art, Washington DC.
I call it the "oculus", but some people use that for the hole in the top of the rotunda dome (as in the dome of the Pantheon, in Rome.)
Either way, it's fun.
#NGA #Oculus