British artist Richard Long is known for creating a kind of extended sculpture informed by his vigorous, solitary sense of quest. Long’s exhibition at the San Francisco Museum of Modern Art, developed during a FOR-SITE residency, documented and reflected on a 250-mile walk in the Sierra Nevada mountains, mainly along the Pacific Crest Trail. The exhibition included photographs, mud works, sculpture, and texts. Continuing the artist’s long-standing use of walking as a basis for art, the work in the exhibition manifested what Long has called “an imaginative freedom about how, or where, art can be made in the world.”