People pose with a work of art by Irish artist John Gerrard entitled 'Western Flag' at Somerset House in central London on April 21, 2017. The art installation consists of a computer generated flag made from streams of black smoke, which is situated in an oil field near Spindletop, Texas the site of the worlds first major oil strike in 1901. / AFP PHOTO / BEN STANSALL / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTIONBEN STANSALL/AFP/Getty Images

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