The sundial is just such a shell. Picture a round face formed by coils of tightly spun rings. If what comes to mind is the terra cotta disk of a patio sundial, you're on the right track.

Vendetti revealed the reason why the tall Japanese wonder shell (Thatcheria mirabilis) and the flat sundial shell (Architectonica perspectiva) fit together is because their coils follow a rule of ...

“That the Japanese wonder shell and the sundial shell ‘fit’ each other is a coincidence of size and evolution. “They both are coiling following the same basic ‘parameters of coiling ...