EVEN Gerald felt rather alarmed when he saw the two contestants facing each other. Ben, who reached a height of six feet one, towered above his small antagonist as the spire of Trinity Church towers above surrounding buildings. A difference of six inches makes the difference between a tall man and a short one. Why is it that a man of six feet looks double the size of a man of five, though in reality only one fifth larger? It is an ocular deception which affects every one, but is not readily explained.