You cannot build shared reality alone. The system requires multiple agents. No individual performer has enough bandwidth, perspective, or creative capacity to sustain a scene by themselves.
Interdependence is not merely an observation about cognition — it is a foundational commitment to build together. The roots below explain why it holds; the law declares that you must act on it. You can know intellectually that meaning requires a receiver and still try to play solo. The law says: don't.
This is a constraint with three roots:
Meaning requires a receiver. If meaning is relational — constituted between minds, not within them — then a single agent literally cannot generate meaning. The offer needs a response. The emotion needs a witness. The reality needs co-construction. This is not about loneliness; it's about the structure of meaning itself.
Bandwidth is insufficient. A single agent must simultaneously generate offers, maintain the environment, track the narrative, manage their body, and sustain emotional truth. The cognitive bandwidth law says simultaneous optimization is impossible. Two agents can distribute this load — one can hold the emotional thread while the other maintains the physical world. The distributed system has more capacity than either agent alone.
Perspective is partial. Each agent sees the scene from one vantage point. The scene's full reality exists only in the overlap of all perspectives. This is why the audience often understands something the performers don't — they hold the meta-view that no individual performer can access.
The Close tradition's concept of "one mind, many bodies" describes the emergent capacity that arises when multiple agents operate interdependently. No single body can hold the full mind. This emergence requires trust — without it, interdependence degrades into polite cooperation, which is a different system entirely (see Trust).
The distinction from Be Supportive: Interdependence is a structural fact. Be Supportive is a behavioral choice. You could play selfishly (violating Be Supportive) while interdependence remains true — you'd just produce bad improv. Interdependence is the constraint; support is the intelligent response to that constraint.
The distinction from Shared Reality Fragility: Fragility says the shared world degrades without maintenance. Interdependence says the shared world cannot be built or maintained by one agent. Fragility is about entropy. Interdependence is about architecture.
When violated: Interdependence fails when performers operate as independent agents sharing a stage rather than co-dependent agents sharing a reality. Signs: monologuing (one person sustains the scene while the other watches), transactional scene work (players take turns but never merge — two solos alternating), and the "helpful bystander" (one supports without ever risking their own contribution).
TJ Jagodowski and Dave Pasquesi demonstrate interdependence nightly — unrehearsed hour-long two-person shows built entirely on the premise that neither of them can do it without the other. The documentary is called "Trust Us, This Is All Made Up." The "us" is load-bearing.