Simon Grant is the editor of Tate Etc. and co-curator of ‘Georgiana Houghton: Spirit Drawings’ at the Courtauld Gallery.
Picabia seemed to sense the edginess of every decade in which he lived – and reinvented his art to reflect it
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It’s not just the Old Masters that get spots – small bumps have started to erupt on modern paintings
The Great Pompeii Project’s restoration of the site has led to a stream of exciting discoveries