But when soft cells are in three dimensions, they do not have any corners. A two-dimensional cross-section of a nautilus shell shows shapes with two cusps and curved boundaries, but when ...

But in three dimensions, things get more interesting—because 3D soft cells, called z-cells, have no corners at all. For example, a two-dimensional cross-section of a nautilus shell shows shapes ...

This version, using soft shell crabs, is a compromise – you get ... pull off the flexible “apron” at the base (it is bell-shaped for females, pointed for males). Turn the crab over, then ...