The Only One Around Boston hardware manufacturer Enoch Robinson took great pride in his individualism. He dropped out of the Masons and Odd Fellows when they became too popular for his liking. And when his first house, a large Greek Revival with an octagonal cupola, was copied by a neighbor, he was incensed. He determined to build a house that no one could duplicate. On a then-rural hillside overlooking the Boston skyline, Robinson chose an uncommon shape-round-and an uncommon building system- horizontal planks laid in a running bond, like brickwork- that assured him of a place in building history. In 135 or so years, the house has yet to be copied. The walls of the house consist of thousands of 1 3/4-inch-thick wood "bricks," each three