The image is a photograph of a book titled "Parts of back plate". The book is open and the pages are divided into two sections. On the left side of the page, there is an illustration of a piece of wood with a rough, textured surface. The wood appears to be old and weathered, with some areas of the wood having a rough texture.

On the right side, there are three illustrations of the same wood, each with a different shape and size. The first illustration shows a large, oval-shaped object with a pointed tip. The second illustration shows two smaller, circular objects with a curved top and a flat bottom. The third illustration shows three smaller, triangular objects with curved edges. The objects are arranged in a triangular formation, with the largest object in the center and the two smaller ones on either side. The text on the page is written in Chinese characters and is likely describing the different parts of the back plate.