Cast in bronze at the Modern Art Foundry in New York in 1967, Tony Smith's "Source" belongs to a pivotal period in the sculptor's career when he was systematically translating geometric logic into three-dimensional form at human and sub-human scale alike. Low-slung and expansive relative to its modest height, the work measures roughly 76 by 84 centimeters at its base, and this horizontal spread gives it a grounded, almost geological presence. The inscription on the underside, reading "T.S. 67 1/6," along with the foundry mark, documents this as the first cast produced, and it carries particular significance as the edition from which Smith subsequently expanded his intentions, revising the total number of casts from six to nine after this inaugural example was completed. That decision to expand the edition after the first casting speaks to the artist's evolving relationship with his own work, and it makes this first cast a record of Smith's original conception before revision. The bronze surface, with its characteristic warmth and density, situates "Source" firmly within the tradition of postwar American sculpture while anticipating the modular and spatial concerns that would define Minimalism's broader legacy. Smith's forms consistently resisted pure abstraction in favor of shapes that feel bodily and intuitive, and "Source" is no exception, its contours suggesting something simultaneously architectural and organic. Smith's reputation has grown substantially in the decades since his death, with major institutional holdings reinforcing his position as a foundational figure in American sculpture. A work like "Source," combining documentary importance as edition one of six within a later-expanded run, a precise provenance trail, and the tactile authority of cast bronze, represents exactly the kind of early Smith that commands serious collector attention. The work ships from Lambertville, New Jersey.