Georgia O'Keeffe is one of those artists we think we know oh so well and hence often take for granted. Gigantic close-ups of flowers? Check! Bleached-out cattle skulls? Check! And it was just such assumed familiarity that made the Norton's "Georgia O'Keeffe: Circling Around Abstraction" such a delightful surprise. Working from a deceptively simple common denominator — abstract works making use of more or less circular forms — curator Jonathan Stuhlman (formerly of the Norton) assembled a career overview that let us see O'Keeffe anew. The show, which originated at the Norton and moved on to the museum devoted to the artist in Santa Fe, partook freely from O'Keeffe's many subjects, including those ubiquitous flowers as well as landscapes and still lifes, with some especially inventive takes on the latter among the highlights. The exhibition gave us a well-rounded portrait of a major American artist who was consistently ahead of her time throughout a long, productive career that spanned the better part of a century.