The sixteen people around you in a rolling omnibus are in turn and at the same time one, ten, four, three; they are motionless and they change places; they come and go, bound into the street, are suddenly swallowed up by the sunshine, then come back and sit before you, like persistent symbols of universal vibration. How often have we not seen upon the cheek of the person with whom we are talking the horse which we passes at the end of the street.