Exhibit highlights architecture as product of its environment

"Hot to Cold: An Odyssey of Architectural Adaptation," at the National Building Museum, is obligatory for anyone who cares about architecture and museums. The exhibition, which opened Saturday, not only surveys the work of the Danish design firm Bjarke Ingels Group, it is designed by the firm itself. BIG, as the company is known, is the same firm hired by the Smithsonian to remake its campus near the Castle on the Mall.