This one I had to bring into Photoshop and do some contrast enhancement on. On images such as this you have to look at the lines of the pattern. And I noticed that there is a marked Jag of the bright spot when it transitions from the wall to the table. What that tells me is that its not something superimposed (or closer to the camera) but rather something which is shining on the wall and angled down on the table as well.
Having said that, I would think that it is light coming in through a window, or the flash reflecting off of something. Either way it is a light source being projected onto the wall/table.