Includes bibliographical references and index.

The subject of the interface -- The interface as form of relation -- Between faces and facing between -- The interface and the surface -- Toward a theory of the interface -- Janus and Jupiter -- Control and power -- The interface and the apparatus -- The interface and the game -- The interface and the machine -- Separation and augmentation -- Mimicry in the game and the interface -- The forming of the interface -- The interface as that which defines the fluid -- Turbulence and control -- The exacting of turbulence -- The demons on the threshold -- Theories of the vortex -- Information and entropy -- Governance and reciprocity -- The interface and teleology -- The turbine as superimposition of fluid and machine -- The vertiginous moment of interface -- The augmentation of the interface -- A genius of augmentation -- The tacit knowing of the interface -- Singularity -- Symbiosis -- System -- Positioning