Sea angels (scientific name: Clione limacina) are only a few centimetres long. Their bodies are transparent, apart from orange-red of the digestive apparatus. The live in deep water under the Arctic ice cap and drift with the current. These fragile-looking creatures fly through the water. They are extremely beautiful and delicately elegant. Christiane Geoffroy chose the sea angel as a poetic emblem of the struggle against rising acid levels in the oceans.