Repetitive directed Tau-flow following fixed patterns. Machines crystallise past Tau-flow (design, manufacture, energy) into reliable repetitive output. This IS substitutable.
Creativity, judgment, care, and leadership require self-referential Tau-modelling. No machine can substitute for the living Tau-address processing its own standing wave.
Labour is directed Tau-flow from a conscious Tau-address. An hour of human labour is an hour of conscious Tau-flow irreversibly expended — it cannot be returned to the worker.
A fair wage returns sufficient Tau-flow tokens to maintain and reproduce the worker's Tau-flow capacity — subsistence, recovery, skill development, and leisure for self-referential modelling.
Exploitation is systematic transfer of Tau-flow from worker addresses to employer addresses at a rate leaving workers unable to maintain their Tau-flow capacity. It degrades the productive capacity of the whole economy.
Machines substitute for routine directed Tau-flow but cannot substitute for self-referential Tau-modelling (creativity, judgment, care). Automation displaces routine labour; it cannot displace conscious Tau-flow.
Meaningful work is Tau-flow aligned with the worker's own Tau-address structure. Such work enhances Tau-flow capacity. Alienated labour is Tau-flow directed entirely by external commands, disconnected from the worker's self-referential model.
UBI is the Tau-dividend of collective mechanised Tau-flow returned to the conscious addresses that authorised the machines. It is not charity — it is Tau-conservation in automated economies.