Style Points is a new weekly column about how fashion intersects with the wider world.

All designers have an obsession; Pierre Cardin's is the circle. From the moon to a spacesuit's globular helmet, the shape fascinates him. You can see it in his work, namely the circular dresses he's designed, and even in his home: one of his residences, the Palais Bulles outside Cannes, is studded with literal bubbles. The appeal of the circle, the 98-year-old designer says in the new documentary House of Cardin, is that it's "infinite." "A square, a rectangle, a triangle has an end," he says. "But a circle is a continuation."