Of course, there is one great virtue in size; and of course, London is the greatest show on earth, for never have so many human characters been gathered together in one place. Here, in a day, you can see the world. Stand at the entrance to a main-line railway station, during the rush-hour, and you see every possible human species scurrying past. One becomes amazed and transported by the multiplicity of the human face, by its infinite differences, by its almost prismatic graduations from ugliness to beauty, evil to good.