Art: Andrew Wyeth's Stunning Secret

Andrew and Betsy Wyeth are the picture of relaxed domesticity as they welcome a visitor to the lighthouse they call home on Southern Island, a 22-acre retreat off the coast of Maine. Tanned and fit, with the kind of face the Romans used to impress on coins, Wyeth, 69, wears a beige sailor's sweater and beige twill pants; his silver-blond hair is closely cropped, like any good sea captain's. Wyeth has been out painting this morning, as he has done every morning for 50 years. "I'm like a prostitute," he says, laughing. "I'm never off duty." As he chats with TIME's...