Transmitting the Spirit, Revealing the Form of Things, Volume 1 to 15 of Hokusai Sketchbooks (Denshin kaishu: Hokusai manga, shohen–jugohen) 伝神開手北斎漫画初編-十五編

The image shows an open book with two facing pages. The pages are yellowed and aged. Each page contains a rectangular drawing of multiple sketches of men in various fighting or wrestling poses. The men are depicted wearing loincloths and have distinct hairstyles. The sketches are done in black ink. The book's spine is not visible, but a dark object appears between the pages. The pages are separated by a thin gap. The book sits on a plain white background.