caption: The image shows a black and white drawing of a man standing in front of a window, with a wall in the background. At the bottom of the image, there is text which reads "leonardo da vinci, 'untitled' from the book of the same name'". The man is wearing a long robe and has a serious expression on his face, as if he is deep in thought. The window behind him is open, letting in a stream of light that illuminates the scene.