Have you ever thought of citrus fruits as celestial bodies, angelically suspended in the sky? Perhaps not, but J. C. Volkamer (1644-1720) did--commissioning an extravagant and breathtaking series of large-sized copperplates representing citrons, lemons, and bitter oranges in surreal scenes of majesty and wonder. Ordering plants by post mostly from Italy, Germany, North Africa, and even the Cape of Good Hope, the Nuremberg merchant Volkamer was...