Can you spot all three faces in this illusion? This is an example of a simple image that uses line drawings.
One of the faces is turning away and appears to be a girl in profile, to the left of the image. She wears a fringe. The next face is an old manís, facing right. The back of the girlís hair is the manís nose and her fringe is his balding head. He wears a moustache. The third face is perhaps the most difficult to find, as it is in the centre of the other two, but it faces left.