When you have a degree in math it is only logical for a few of your patterns to end up with a geometric theme! The Circle and Square Patterns are the ones that have been created over the years with, well, circles and squares. The earliest patterns were the Lino, inspired by train tracks, the Solomon, composed of a series of circles, and the Natan, with squares in a carved background. The Natan and the Solomon patterns were even named after mathematicians. More recently, the Spot On pattern was added, with a series of target-like spots.
The circle and square family of patterns are gender-neutral, though we do admit they are quite a bit less feminine than our flowers.