John Marin: The Breakthrough Years (Meredith Ward Fine Art, 44 E. 74th St., up through Jan. 11). Subtitled “From Paris to the Armory Show,” this exhibition of twenty-eight watercolors painted between 1904 and 1914 by the pioneering American modernist shows with breathtaking clarity how he broke free from received ideas about representation, assimilated the language of European cubism, and forged his own distinctively American style. Once again, a Manhattan gallery does what one of New York’s art museums should have done–and gets it exactly right (TT).