Illustrated book

The image shows a page from an illustrated book by the artist Akiyama Kenzō. The page is yellowed with age and has black lines drawn on it. The lines form geometric shapes, including rectangles and triangles. Some of the rectangles are divided into smaller sections by additional lines. There are several Japanese characters written in black ink on the page. The characters are written vertically on the right side and horizontally in various sections of the page. The background of the page is a light yellow color, with some darker spots and marks.