Joseph Wright of Derby’s Theater of Enlightenment at London’s National Gallery

Joseph Wright of Derby, An Experiment on a Bird in the Air Pump, 1768. The National Gallery Photographic Department

A white cockatoo is on the verge of death as air is sucked from its glass trap. Two young girls look on, aghast. Maybe the croaking fowl is their pet? That unfortunate bird is the center of attention in Joseph Wright’s 1768 painting An Experiment on a Bird in the Air Pump. A beloved artwork in the U.K., the piece is a marquee draw in the National Gallery in London’s new “Wright of Derby: From the Shadows” exhibition. It is not as if Wright did not have alternatives to using the demise of a fine-looking bird for the image. A sealed paper bag would have inflated as oxygen was removed from the glass globe, for example. But that would have been boring, and Wright was a dramatist. Plus, none of this would be happening without the wild-haired pump operator looking out from the canvas. He is in charge. If he stopped the pump and allowed the air back into the glass, the bird would survive. Talk about tension.

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Born in the northern English town of Derby in 1734, Joseph Wright was working during the Age of Enlightenment. The air pump was a relatively new invention, a contraption that demonstrated that the atmosphere was something that could be manipulated, a radical idea in the eighteenth century. Until then, religion and ancient philosophy had explained what things were. Air was an Aristotelian element, an unchangeable substance that sat between earth and fire. So, amid the drama, Wright was also documenting the kind of scientific development that characterized the era’s new thinking. His 1771 painting The Alchymist, in Search of the Philosophers Stone,........

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