Paul Allen’s (1953-2018) spectacular collection has achieved an unprecedented $1.6 billion (£1.34 million) over two sales at Christie’s, becoming the most valuable private collection of all time. The first sale alone of 60 works fetched £1.5 billion (£1.26 billion) – the highest total ever recorded at a single auction. Allen’s estate will donate all proceeds from the landmark sales to philanthropic causes.

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