A doodle is a drawing made while a person's attention is otherwise occupied. Doodles are simple drawings that can have concrete representational meaning or may just be abstract shapes.

Typical examples of doodling are found in school notebooks, often in the margins, drawn by students daydreaming or losing interest during class. Other common examples of doodling are produced during long telephone conversations if a pen and paper are available.

Popular kinds of doodles include cartoon versions of teachers or companions in a school, famous TV or comic characters, invented fictional beings, landscapes, geometric shapes, patterns and textures.

https://en.wikipedia.org/wiki/Doodle

"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Professor Farnsworth
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