Regarding this entry --> http://www.wetcanvas.com//Community/...entry_id=45179
The basic idea could work very well, However I would avoid anything TOO large on the side walls. The reason is, if the object is dimensional, and is SUPPOSED to be stickink away from the wall, when our perspective changes on it, and we sway over to another side, we expect the object (the sofa in this case) to remain in view- In fact, it should become MORE visisble... I hope this makes sense. You are better off painting things that are close to the wall, for example picture frames, windows, doors, etc...
Take a peek at the room that I did
, and the rooms that Kreg Yingst
does. Little or nothing protruding from the walls. You have to be careful- Everything that you do needs to trick the eye into reversing the image so the illusion works!