The city was laid out in a roughly circular design, with its major streets either concentric circles or spoke boulevards. Salis D'aar's three districts were also concentric circles identified by different-colored streetlights. The inner district was primarily for public building and lit blue-white, the middle district was mostly divided between residential and commercial buildings and lit pale yellow, finaly, the outer circle was reserved for service buildings and light industry and lit deep red.[1]