George and Jane Judy Rosie Astro Mr. Spacely Size Chart     Model Sheets are reference charts for animators that tell them everything they need to know to keep a consistent look for the character they are drawing, which is important because many different artists may ultimately work on the same scene. Of special note here are the Preliminary Designs -- these are rare early concept drawings from 1961, possibly the first drawings done of The Jetsons. The character and vehicle designs changed dramatically for the final model sheets. Joe Barbera discusses the reason the cowlick in George Jetson's hair exists on the model sheet but not on the show.