15 Innovations That Shaped the City Zoning: The Legal and Social Codes of Urban Planning What began as a policy innovation to help organize cities has contributed to segregation and severe housing shortages. 9 Sep
15 Innovations That Shaped the City Elevators: How Cities Rose to the Occasion Elevators proved to be a primary engine of urban density over the last century, boosting economies of scale for big cities and redefining urban life. 9 Sep