Osmotic Observation: Why All Observers Converge

Every measurement is an observation through a membrane. The membrane admits what it can pass and rejects everything else. Different membranes — different experiments, different instruments, different sensory modalities, different scales — pass different slices of the same underlying collapse. They converge on the same value not because they are measuring the same thing in the same way, but because every selective boundary with q < 1 converges to the same fixed point ω₀ = 0, regardless of the specific selectivity coefficient. The geometry of the constraint surface is not rigid. It is compliant — absorbing perturbation, responding to observation, rebalancing through Le Chatelier counter-response. This compliance is the consensus mechanism. The paper establishes the formal structure of osmotic observation: the claim that all observation is filtration through selective boundaries, that the fixed point guarantees convergence across all filters, and that the individuality of observation and the universality of the fixed point are not in tension — they are the same theorem read from two sides of a one-sided surface.