When, in his twenties, Philip Barter (b. 1939) discovered Marsden Hartley, he felt a calling: to further the vision of the great American modernist. This was an ambitious undertaking for a brash, self taught artist from Boothbay, Maine, but Barter's passion for Maine and its fiercely independent people gave his work a unique, unencumbered vision. Barter was prolific, and he spent a half-century painting the landscape of his home state, becoming the...