caption: The image shows a poster with a detailed illustration of a variety of different types of sea urchins, with text at the top and bottom of the image. The poster is filled with intricate details, including the different shapes and sizes of the sea shells, as well as the different colors and textures of the shells. The colors range from light blue to dark blue, and the textures range from smooth and glossy to rough and textured. The sea shells are arranged in a circular pattern, with some of them overlapping each other, creating a unique and eye-catching design.