The metaphorical representation of a devil and an angel on a person’s shoulders dates back to the 16th century1. Throughout the 17th and 18th centuries, this concept was prominently featured in plays and allegorical art. By the early 1900s, it had found its way into cartoons as a visual shorthand to depict the internal struggle between virtues and vices. The angel serves to keep one on the “straight and narrow,” while the devil tempts one toward ...