A cel (short for celluloid) is a blank clear plastic sheet
used by the studio artist to paint an animated character
or object based on the animator's original pencil drawing.
The cels are then placed over a background and photographed
in sequence to produce an illusion of life in the completed
film or cartoon short. Every cel is different but this
does not mean that every cel is unique. Often multiple
copies of a cel were created by the Inkers as colour models
in order to advance their technique and skills.