The ErgoQuest 500 is a stand for your monitor and keyboard that allows you to use it in many different situations. It’s adjustability allows you to use it comfortably(?) in bed, or while standing. You can use it as a desk as well, but at $3695 it would be stupid to relegate it to such an ordinary function (the price tag covers a motorized tilt for the monitor and the adjustable height legs.)
After looking at the picture above, I think that working in the prone position would worry me. All I can picture is that monitor slipping out. Besides, rather than spending that $3700 so I can Google Jessica Alba in bed I could probably have a whole lot more fun blowing it on a wild weekend in Vegas.