Since copper is a commodity, its cost fluctuates and installation can be both difficult and expensive. The Burkes bought their copper when it was at a 15-year low. For the first two weeks, the house was as shiny as a new penny, then it began to weather. “It incited a local controversy,” says Carrie. “But we understood that time would prevail. Now we’re happy when people say they don’t know of a copper house on Park Street.” One possible source for copper is Una-Clad. www.unaclad.com  Photo 3 of 6 in This House Tells the Time With an Oculus