Picasso painted a series of 15 variations on Eugène Delacroix's "Women of Algiers" in 1954-55, working through the composition again and again — "Version O" is widely considered the culmination and finest of the entire series.
Christie's 2015 sale was, unlike several entries on this list, a fully confirmed public auction result — at the time, it briefly held the title of most expensive artwork ever sold at auction, before Salvator Mundi surpassed it two years later.
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