A lady licking an envelope. An intimate thing. It might be only the bill from the coal-man she’s paying, but it has the feel of something else: an assignation, a confession, an apology, a breaking-off. Would this woman in her deep-blue day dress and jacket be so unguarded if the artist had been a man? Mary Cassatt (1844–1926) was a femme sérieuse who painted women of quick wits and tender instincts.