caption: The image shows an old postcard with a drawing of a man and a dog on a street in Frankfurt, Germany. The postcard is from the 18th century and has text written on it. The man is wearing a long coat and a hat, and is holding a cane in one hand and a book in the other. The street is lined with buildings with windows, and there are a few people walking on the sidewalk. The sky is visible in the background.