This is a Star Wars poster that I own:
It's a collage of different scenes, characters and other elements from the Original Trilogy.
Near the top is this orb, apparently floating above a hole in a flat circular container:
It doesn't resemble any element of Star Wars that I know of, so I was hoping someone could tell me what it is. I know it's not the Orb of Peace, as the poster only shows things from the Original Trilogy. It looks vaguely like part of the Death Star, but not like any part I recognize.