Brine · Coral · Current · Plankton · Shell · Swell

A Coral is an animal that builds a mineral house. Brine is water that has kept its salt. A Shell is calcium left after a soft body, later a stone the shore keeps. Plankton drifts where light still reaches. A Swell is a wave that has not yet broken. Current is the directed flow those bodies cannot refuse.

Shoal is not a seventh object among them. It is the edge becoming a theme: salt, small life, and moving water agreeing to occupy the same shallow. The card keeps Salt, Water, and Wave as the split. The map keeps the six that made the edge visible.