I am thinking of ceiling mounting my CX1 with some help from mirrors. Yes I know the projector is not intended to be upsidedown and all sorts of things can happen e.g the heat disspation. My thought is to use two small mirrors like a periscope but with one of the mirrors twisted, like this \____/. The picture will be correct if the proj is upsidedown and it will be on the other side of the wall so you have to mount the proj backwards also. The negative affects would be that i would loose some light stength. If you calculate that each piece of glass has 4% less light when it passes thru you would have only about 84% left when it has passed thru all the glass (each glass is passed twice sine it is a mirror) Correct??. But if I could use mirrors which are antireflection treated I would loose almost nothing(1 or 2 %). (I just don't know where to get those) The positive affect would be that the distance to the screen can be less in order to get a bigger picture. /Kurben.