Let this charming ‘Rare Crab-Form Tureen and Cover, Qing Dynasty, Qianlong Period’ from the collection of Nelson & Happy Rockefeller lighten your mood. Among the exceptional works of Chinese export ceramics on offer from the famed couple’s collection, this delicately and realistically modeled tureen is one of only four published examples, with one remaining in private hands, and the other two each residing in the Peabody Essex Museum and the Royal Academy Collection. n