Conchology, or shell collecting, is the practice of  finding and usually identifying the shells of mollusks, a popular avocation, or hobby, in many parts of the world. https://www.britannica.com/topic/shell-collecting

I am not a collector of shells, but I admire their colours, shapes, textures and glaze. They are perfect subjects for still life images. Here are some photos of shells – far from being as beautiful as the originals.