Visitors to the Victoria and Albert Museum’s new storehouse in Stratford’s Olympic Park are being enthralled by an atmospherically lit chamber devoted to the display of one vast and magnificent work of art: Picasso’s 10 metre-high, 11 metre-wide drop-curtain for Le Train Bleu , a popular hit of Diaghilev’s Ballets Russes, first seen in 1924. The canvas, for many years rolled up in storage, isn’t strictly the work of Picasso himself: Diaghilev’s scene painter Prince Alexander Schervashidze had meticulously expanded it overnight from a small gouache on plywood known as ‘Two Women Running on the Beach’ (1922), but Picasso was so delighted when he saw the result that he decided to endorse it with his signature on the bottom-left-hand corner.

Cocteau spotted Picasso and corralled him and Sat

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