'Are you symmetrical?" asks the interior designer Gwen Kenny as I glance anxiously at the mirror. But she isn't talking about my eyebrows. Kenny is talking about symmetry in the home. "One of the ...

Symmetry abounds in nature, often in its most beautiful forms. A perfect snowflake, a blooming sunflower, a light-harvesting complex from a bacterium—they all exhibit striking symmetry, crafted by ...