Nancy Spero’s “black paintings” were made mostly between 1959 and 1964, when the artist, then in her 30s, was living in Paris with her husband, the painter Leon Golub, and their children. In that the paintings are expressionistic they seem anticipatory, heralding the stylistic concerns of today, and it is in fact only in the last few years that this work has found its audience. (A second show, this one with a catalogue, recently opening at Carnegie-Mellon, in Pittsburgh). But the fact that the 25 images of lovers and mothers exhibited here are prophetic does not entirely explain their haunting