“[G]uesses about the fashions of the future are generally quite wide of the mark, because they are founded on a very obvious fallacy. They always imply that public taste will continue to progress in its present direction; which is, in truth, the only thing we know that it will not do. A thing that wanders away in great winding curves may end anywhere; but to turn each curve into a straight line striking out into the void will be wrong in any case.”