Artists paint over their finished canvases for many reasons — out of frustration at a failed design, because they lack the funds to buy more material, or even to spite whoever or whatever they’ve depicted. The latter was the case in Amedeo Modigliani’s “Portrait of a Girl” (1917), an oil painting of a sullen, seated brunette now held in the collection of the Tate. X-ray studies of the canvas conducted by the museum in 2018 revealed that the piece was originally a full-length portrait of another woman, a slender blonde with angular, elongated features. A portion of this hidden painting — now on view at Lebenson Gallery in London — was uncovered and reconstructed by two scientists using a combination of stereoscopic imaging, artificial intelligence technology, and 3D printing.

Neuroscientist Anthony Bourached and physicist George Cann joined forces in London in January…

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