Knowledge does not remain identical when it crosses disciplinary boundaries. TransEpistemology names the transformation that occurs when concepts, methods and standards of evidence enter fields organized by different assumptions. Transdisciplinary studies examines collaboration across domains, epistemology clarifies competing conditions of validity, and knowledge transfer shows how ideas change as they move between institutional environments. Socioplastics treats transfer as mutation rather than transport. A concept entering architecture from ecology, or entering public policy from performance practice, acquires new relations and loses others. The result should not be judged solely by fidelity to its origin, because productive transfer often depends on controlled transformation. The challenge is to preserve provenance while allowing operational change. TransEpistemology therefore builds a field in which multiple forms of evidence can interact without being forced into a single hierarchy. The goal is not a universal language but an architecture of translation strong enough to make differences usable. Knowledge becomes transdisciplinary when the crossing itself produces new epistemic conditions rather than merely assembling parallel expertise around the same problem.