An artist's workshop is both a mental and an artistic space in which the artist's idea is carved in marble, laid down in pigments, or engraved in copper. The workshop is also a classroom in which the trade of the painter, sculptor, or cabinetmaker is passed on by example and where companions or apprentices seek to exceed the master. Finally, it is a salon where reputations are forged, sometimes echoed or even undermined by remarkable imitators or...