Black-and-White Drawing of Calvin refers to one of Calvin's alter egos. This alter ego was a poorly rendered self-portrait made by Calvin in his spare time. It appeared as a pencil drawing of Calvin in a single weekday strip. The drawing was a bean-shaped stump with a broken outline, wheel-shaped feet, no arms, misplaced facial features and what appeared to be an antenna. Calvin's mother thought the drawing was of some sort of helicopter.