This is a vintage black and white illustration depicting an optical illusion. The main subject is a man with a beard and mustache, wearing a suit and tie. He is looking through a long, cylindrical telescope. Above and to the right of the man's head is a small depiction of a statue of a person standing on a pedestal. A beam of light appears to travel from the statue, through the man's hand (which is raised in front of his eye), and into the telescope. Below the man, there is a smaller, mirrored depiction of the statue and the light beam. The background is filled with diagonal lines, creating a sense of depth and movement. At the bottom of the image, the caption reads: "Fig 140. - An optical illusion."