This article traces the invention of the relational circuit, which makes possible an art of relationships called Threeing. This process of invention grew out of extensive video replay. Contrapposto made it possible to depict motion in stone. The relational circuit likewise makes possible a formal art of relationships for three people. This art form can be viewed in the light of relational aesthetics, a theory that judges artwork based on how it prompts inter-human activity and engagement with the world.