I took an art elective in college. One of the exercises they had us do was to find a black and white face in a magazine, cut it in half down the center of the f

I took an art elective in college. One of the exercises they had us do was to find a black and white face in a magazine, cut it in half down the center of the face, tape it to a piece of paper and mirror the face on the paper. To get full credit, when the paper was hung up on the wall across the room, the professor could not tell which side was the magazine picture and which side was your drawing.