caption: The image shows a black and white etching of a man sitting on a chair next to a ruler, with a scale on the left side of the paper. The man is wearing a long coat and a hat, and is holding a cane in one hand and a book in the other. He has a determined expression on his face, and his hands are clasped together in front of him. The scale is a standard ruler with a variety of colors, ranging from light to dark.