For sixty-plus years, Helen Frankenthaler made paintings, prints, woodcuts and sculptures. “My pictures are full of climates, abstract climates… not nature per se,” she said, “but a feeling…” Her works are feeling, just as nature is, at once deep, mystical, impenetrable, and ineffable. How to pin down the feeling of a sunrise or one of Frankenthaler’s large paintings—they invoke feelings that are deep in, yet essential. Frankenthaler had the unique ability to reach into herself and consistently pull out onto the surface...