What is a book cel?
A book cel is a cel with either a foreground and background or a multi-layer background. The term book implies that the foreground and background make for ‘covers’ on a hardback book (the acetate being the pages). However, I’ve seen it apply to cases where the cel is not in the middle (as in a multi-layer background). It still applies in the case where the foreground is done background style on a piece of acetate.
