“Seasoned explorers, vehemently insisting on what they had seen, set down mountains and islands on their charts where there was nothing but empty sky ... Expeditions sent out later to verify these new lands sometimes saw the same fata morgana, further confusing the issue. Only by prolonging their arduous journeys, thereby observing a constant receding of the image, did they prove that the land was not there at all.” —Francis Spufford