The individual cels that go together to make up a cel setup. Due to technical considerations, it was very rare for two or more separate characters to be included on a single cel level. Usually, each element was on its own cel, with up to a maximum of five levels to a scene. Because of the added density of the multiple cel levels, the paint colours were corrected for the discoloration caused by the plastic, making the colours on a bottom level cel much brighter than those on a top level cel.