AP Photo

Maybe the first decade of the 21st century will come to be known as the great age of headroom. During those years, new houses had great rooms with 20-foot ceilings and entire new art forms had to be invented to fill the acres of empty overhead wall space.

People bought bulbous vehicles like Hummers and Suburbans. The rule was, The Smaller the Woman, the Bigger the Car — so you would see a 90-pound lady in tennis whites driving a 4-ton truck with enough headroom to allow her to drive with her doubles partner perched atop her shoulders.