THROUGH the ages, artists have insisted on proper light to work by, picked their studios accordingly. But as their canvases moved into the hands of collectors and into museums, such meticulous care was rarely taken. Paintings have been plastered on walls from floor to ceiling, hung in dark corners, sometimes illuminated by smoking candles. Even today the museumgoer in Europe can find himself trapped in darkness in Madrid's Prado,* engulfed in fog in London's National Gallery or lost in Florence's unlighted Pitti Palace on a rainy day.

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