Georgina Adam has this interesting little nugget about the 1913 Ernst Ludwig Kirchner street scene that sold in London last week:

The back of the work, which bears an angular portrait of art historian Botho Gräf, was originally the front. Left in the artist’s studio on his death, the painting had the estate stamp put on the street scene, which was then the back. But by 1997, when the work sold at Sotheby’s (for £1.98m), it had been reversed, thus joining the group of paintings of colourful Berlin streetwalkers for which Kirchner is renowned.

Bidding for Stability in a Time of Uncertain Values (Financial Times)