I use wall and ceiling interchangealby in this case, because it's really neither. The front and back walls of the room are 8' high, but the ceiling in the center of the room is 10' high. The wall (or ceiling, am I confusing you yet?) angles in towards the center of the room at both ends to reach the 10' height.

I will look into your suggestions, thanks.

"the dream never dies, just the dreamer"