Enclosure System

The port and coupler architecture creates a modular but semi-permanent system.

The port and coupler architecture creates a modular but semi-permanent system. Each biome has two left ports, two right ports, one bottom port, and three top ports, all 3-inch diameter permanently drilled bulkheads. These are physical drill locations, not a one-to-one map onto the three connectivity layers. Connections between tanks use Fernco rubber PVC couplers with rigid PVC sections for routing that accommodates the elevation differences and directional requirements of each biome pair. Rearrangement is possible but requires draining, disassembly, and resealing. The boundary definition matters for Research claims. Inside the biosphere boundary: all six biome tanks, all four atmosphere tanks, internal air and water volumes, soil and substrate, organisms, condensation surfaces, rain reservoirs, and sealed ports and couplers. Outside the biosphere boundary: external lighting fixtures, electrical control systems, chiller hardware, external coolant loop hardware, and room air. The target state defines mechanical final closure as no gas, liquid, or solid matter crossing that boundary; biological final closure as a food web whose energy ultimately derives from light-driven primary production, with materials cycling internally while energy flows through; and chemical final closure as all elemental cycles contained within the system. Energy may still cross the boundary in the target state as light, externally imposed heat exchange, and externally actuated tidal motion; matter exchange is the closure criterion. The room around the tanks is outside the boundary. Josue intends to build a modular, removable insulated wall over the inside of the two-car garage door to reduce daytime heat entering the workspace. That is room-envelope support, not a change to the tanks' sealed boundary, and it remains an unvalidated design intention without a final specification or reported construction.

Closure vs. experimental refinement: The current sealing boundary explicitly permits organism addition and removal for experimental refinement, while the target state eliminates organism introduction entirely. The current research period is still a phase of community building: species are being added, tested, and sometimes removed as the ecological system is assembled, and water has occasionally been topped up by hand. The path from an open prototype with active management to a fully closed system with no intervention is the most consequential unresolved transition in the Enclosure's trajectory and defines when the system's ecology can be attributed to internal cycling rather than managed assembly.

Atmosphere tank coverage gap: Freshwater Lake and Seagrass Meadow do not have their own atmosphere tanks. They route humid air into adjacent tanks. Whether this indirect coupling is adequate for full water-cycle participation is not confirmed. New aquatic atmospheres for those two biomes are a later possibility only, outside the Fall 2026 core.

Century target vs. present materials: The 100-year unopened target sets a much higher bar than the near-term hardware that will actually be sealed first. Soaker hoses, rubber couplers, 3D-printed parts, and mixed-material bearings are explicitly not certified for a century, while the glass-and-silicone direction is unengineered. Sealing on near-term hardware and meeting the long-term target are separate questions.

Sealing sequencing confirmed, timeline still not: Permanent sealing follows a specific three-stage dependency chain (interior rebuilds, then Rain System rebuild, then physical sealing), which clarifies what has to happen first without saying when. Each stage depends on separate Hardware work landing, so the practical date for reaching the target closed state remains open.