caption: The image shows a page from a book with a variety of different types of sea urchins, each with its own unique shape and size. The page is filled with intricate details, from the shells of the sea creatures to the intricate patterns of the shells. The colors range from light to dark, with some having a more muted hue than others. The shells are arranged in a symmetrical pattern, with each one having a distinct shape and texture. The background of the page is a light blue, giving the image a calming and peaceful atmosphere.