There are certain things that pretty much everybody does. Whether you live in a Sri Lankan village or downtown Chicago, you eat food, you wear clothes, you talk, you move around. Culture is how a group of people does those things. Distinctions between cultures are based on how they do the same things differently. Cultures form within the field of architecture. And architecture can also be a part of a broader culture. This book traces a history of connections between the twoÑbetween a genre of projects within architecture and its connection to far reaching trends and ideas. The architectural projects are selected and sorted based on how they use regular curves in plan. Collectively, the projects figure a history that begins in the 1920sÑan era when the fillet, or rounded corner, became a feature of the modern planÑand ends with the rise of spline based geometry in the 1990s.