Since the 1950s, American architectural trends have tended to favor open-concept plans, with one room flowing into the next. But there was a time when the typical house didn’t open into one sweeping, uninterrupted space. Instead, it presented a series of thresholds — doors upon doors, each one leading to a room with its own function, level of privacy, or place in daily life.  You might remember visiting your grandparents’ home and noticing that certain doors were closed “to keep the heat in.” Or maybe your house had a swinging kitchen door that didn’t stay ...Read More