The book was born after a trip to the seaside, when I felt the world's smallest seashells beneath my feet—completely or almost completely devoid of color, tiny, and extremely fine. I realized that, within the curve of the shell there was something hidden. What do they take and bring back from their journeys across the seas? What do they hide in this come and go? They are carapaces, shells, cocoons, their own islands—hence the name Poseidonia.