We were asked to fabricate a large site model by Steven Holl Architects for their project in the new “Eco-City” near Tianjin, China. The Ecology and Planning Museums designed by Steven Holl will be the first two buildings in the cultural district of the new city. The site model was cut from a large block of high-density polyurethane foam on our CNC router. Given the fairly uniform nature of the foam, we were asked to test subtle variations in toolpath stepover in order to differentiate the various surfaces of the site.