54, no 7/8, 1984, p.43 In response to this, Krier proposed the reconstruction of the European city, based on polycentric settlement models which are dictated not by machine scale but by human scale both horizontally and vertically, of self-sufficient mixed use quarters not exceeding 33 hectares (able to be crossed in 10 minutes walk) of building heights of 3 to 5 floors or 100 steps (able to be walked up comfortably) and which are limited not by mere administrative borders but by walkable, ridable, drivable boulevards, tracks, park ways.