This article was originally published on Common Edge.

New Orleans was designed by its early settlers in 1721 as a Cartesian grid. You know it as the famous French Quarter or Vieux Carré. Such grids are named for the Cartesian coordinate system we learned to use in algebra or geometry class, perpendicular X and Y axes, used to measure units of distance on a plane. The invention of René Descartes (1596–1650), these grids reflect his rationalism, the view that reason, not embodied or empirical experience, is the only source and certain test of knowledge. William Penn used a similar grid in 1682 in selling Philadelphia as an urban paradise where industry would thrive in the newly settled wilderness. And just as the massive buildings of Italian Rationalist (i.e., Fascist) architecture express authoritarian control, so, too, Cartesian grids implicitly say: Someone is in charge here. We’ve got this. Trust us.