"The Master of the Marble Madonnas was the name given to an unidentified sculptor, or perhaps group of sculptors, active in the Tuscan region of Italy ...
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between c. 1470 and c.1500. He is thought to have been responsible for a group of stylistically related sculptures that is based mainly on their related compositions and drapery forms. Products of the Master´s workshop include a large number of reliefs of the Virgin and Child; busts and reliefs depicting the suffering of Christ were also popular, as were busts of children. Various mannerisms can be seen in this group, as well; among these has been what is described as "a peculiar feline smile from heavy-lidded eyes and a taut jaw, at its best radiating inward joy but often acerbic or bordering on the manic"" - (Wikipedia (en) 17.10.2020)