Ledoux explored visionary architecture based on simple geometry.  Below is one of his famous series of buildings The Royal Saltworks of Arc-Et-Senans, this illustrates how over 250 years ago he created radical work based on marrying rationality and aestheticism.  It has a radius of 185 meters which has five buildings comprising the arc and five others the diameter.  Nine paths cross and converge on the director’s house in the middle.