What could this be??

[xdxb]

I took this picture earlier today at my parents house. Looking at it again I notice there's a black ball or something at the top. What could this be?? (Look to the top right behind the doorframe. I'm trying not to freak out right now. Could it be a lightshade? I would look again but I'm not at my parents house. http://img404.imageshack.us/img404/4240/screenshot20120910at124.png

Thank you in advance!!