caption: The image shows a black and white photo of a variety of sea urchins on a page from a book. The page is filled with various types of shells, each with its own unique shape and texture. The shells are arranged in a circular pattern, with some overlapping each other. The colors range from light brown to dark brown, and the shells have a glossy sheen. The text on the page is written in a bold font and is surrounded by a thin black border.