The city of Giza was a theoretical study for a high-density city, amidst the existing ancient pyramids, which could accommodate the resettlement of 250,000 Palestinian refugees. Giza illustrated a number of concepts which Moshe Safdie had been exploring prior to Habitat '67 such as workable high-density environments, three-dimensional reorganization of urban land uses, the organization of individual dwellings as spatial groupings, the hierarchical organization of transportation networks, and the utilization of mass-production construction techniques.