On display at ACA Galleries (529 West 20th Street, New York, NY 10011) is a selection of Jim Marshall's stunning black-and-white photographic studies of the peace sign, from "Peace," the new book of his work. The peace sign is a symbol embraced by the counterculture movement, which remains relevant as the universal message of free speech, opposition to war, nuclear disarmament, and hope. Marshall documented how the peace sign transformed from an antinuclear message to the universal symbol for peace.