"Shells' Shapes" are molds for the sea made with biomaterial derived from shells. The peculiarity of these toys lies in their complete biodegradability at the end of their life. At the base of their creation lies the problem of environmental pollution due to synthetic plastics, which gave birth to a great parenthesis that every day involves each of us. This has led to having to look for solutions to reduce the excessive production of waste that ends up in the seas and oceans. A model to follow is that of circular economies that reduce and eliminate waste. The idea proposed is to replace the games for the sea, often left on the beaches, with a product that could be "easily" forgotten in the sand since it does not alter the ecosystem. The choice to act on the world of children comes from the assumption that they will take care of our planet and this project is a possibility to make them reflect and at the same time have fun. The key words are: "Collecting is better than Throwing!"