A field does not become public simply by expanding. It becomes public when it learns how to be read from outside without surrendering the density that gave it form. External legibility is therefore not a matter of simplification, but of controlled projection. What must appear is not the whole mass, nor the entire archive, but the set of relations capable of transmitting the structure of the whole. Selective fixation names this operation. It is the deliberate choice to stabilise certain concepts, links, and entries so that a larger system can be perceived through a limited number of hardened points. This matters because contemporary knowledge spaces reward visibility while punishing complexity. Under such conditions, an unfiltered corpus risks dispersion, flattening, or noise. Selective fixation offers another route. Instead of translating everything into the idiom of the commons, it identifies those units with enough internal force to survive transfer. A concept enters the exterior only when it can carry part of the system with it. In that sense, fixation is not reduction but calibration. The result is a more exact politics of appearance. A project does not dissolve itself in order to circulate; it constructs thresholds through which circulation becomes possible. External legibility is thus achieved not by weakening the internal architecture, but by choosing where that architecture touches the world.