Charles W. “Plot” Plotner was a cartoonist who had developed a template-based cartooning set for kids circa 1952 called "Plot-O". A companion set was called "Plot-O the Clown".

"Plot-O" consisted of two plastic templates with pre-cut and numbered cartoon shapes. By following the simple directions and tracing the corresponding parts, any youngster could create basic cartoons of people and finish them off with their own details.

The hand-lettered instruction booklet provided the design inspiration for Cartoon Panel JNL.