Many people know that Edgar Degas (1834-1917) was a French artist and leading light of Impressionism, whose paintings brilliantly capture the movement of ballet dancers. What, perhaps, they don't know is that by his mid-twenties he had made over 700 copies of other artists' works; that he produced 1,500 studies of ballet dancers, one of which sold in 1999 for over GBP17 million; and that, although Degas exhibited only one sculpture in his lifetime, 150 wax figures were found in his studio after his death.

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