XIR163407 The importance of knowing perspective, 18th century (engraving) (b/w photo) by Hogarth, William (1697-1764) & Sullivan, Luke (1705-71); Private Collection; (add.info.: "Whoever makes a design without the knowledge of perspective will be liable to such absurdities as are shewn in this frontispiece"; lighting a pipe from a window;); British, out of copyright.