Jack saw no difference between East water and West water. They were in a part of the world that, on the Doctor’s maps, either had not appeared at all (it being considered sinful wastefulness to leave such a large expanse of fine vellum blank) or else had been covered up by some vast Barock cartouche with words printed on it in five-hundred-mile-high letters, surrounded by bare-breasted mermaids blasting away on conch-shells. Minerva had crawled underneath the legends, compass-roses, analemmas, and cartouches that were superimposed on all the world’s maps and globes, and vanished from all charts, ceased to exist. Jack had a phant’sy of some young Princess in a drawing-room staring at a map, and seeing a bit of movement under the eastern edge of some bit of engraver’s trompe l’oeil, a scrap of faux-weather-beaten scrollwork where the cartographer had writ his name. She would suppose it to be a wandering silverfish at first—then, peering at it through a magnifying lens, would resolve the outlines of a certain ship filled with mercury...