So, what do the successes of Cape Cods, bungalows, and mobile homes tell about the vernacular process in industrial times? For one thing, vernacular is no longer regional, except in detail. (Mobile homes in really hot climates, for example, often grow an extra roof to ventilate away the radiant heat from the sun. In cold climates, pitched roofs are added to shed snow.) Successful building forms are broadcast nationally, driven by the national market economy. Builders and developers imitate the most successful of their competition. That is how buildings learn from each other in this century.
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