To successfully create a believable world in which monsters live, work, dine, and date, each individual prop and element of architecture had to be part of the whole approach for Monstropolis. The world needed to echo the human world and yet be monster specific. Details of Sulley’s apartment, one of the first sets to be developed, exemplified the depth of the thought process that played a part during the design stage of production. Brick buildings reinforced with steel, like those from the 1900s, felt like they could support monsters who weighed as much as 800 pounds. Household appliances ran on scream energy instead of electricity—so everything like the TV, stereo, and lighting hooked up to conduits that suggested a supply source similar to natural gas.