caption: The image shows a page from a book with a drawing of various types of sea urchins, each with its own unique shape and texture. The page is filled with intricate details, from the shells to the intricate patterns of the shells. The colors range from light brown to dark brown, and the textures range from smooth to rough. The shells are arranged in a symmetrical pattern, with some overlapping each other. The background of the page is a light blue, giving the image a calming and peaceful atmosphere.