Édouard Manet: Le déjeuner sur l'herbe

Painted in 1863 by Edouard Manet , this radical work broke every rule in the book as it irrevocably changed the way nudes were painted. Then, as now, audiences were bemused by the bizarre depiction, fraught with curious detail and quotations from other paintings, prompting many to call it the first piece of art about art. An inspiration to many, Picasso created 180 versions of it.