The root of the interconnections between MaH (gematria 45) and BaN (gematria 52) lies in the Unknown Head while the results are found in the Partzufim, and both are concealed.
radla — the Reisha delo ityeda, the Unknown Head — is the upstream concealed root of the interconnections between MaH and BaN. Above Atik Yomin; structurally unspecifiable.
Op. 85 opens the Unknown Head unit (Op. 85–89) with the foundational claim. radla is the cosmic-philosophical ceiling of investigation — the level above Atik where the interconnections of MaH and BaN have their root, but where investigation cannot reach.
Atik holds the unique arrangement of MaH-BaN connections in each Partzuf (Op. 84). But where do the interconnections come from? Klach's answer: radla — the Unknown Head. radla is above Atik in the cosmic hierarchy of concealment; it is structurally unspecifiable; investigation cannot specify it without dissolving the structure being investigated.
Both the root (in radla) and the results (in the Partzufim) are concealed. The Op. 84 outer-visibility applies to the operational function of each Partzuf; the unique combination that produces the function is concealed; and the root of the unique combinations — radla — is radically concealed, beyond even the Op. 84 concealed level.
This is Klach's deepest structural-philosophical move. The cosmic government has layers of concealment, not just a binary concealed-revealed distinction. radla is the deepest layer; Atik's unique-arrangement doctrine is the next layer; the Partzufim's outer functions are the visible surface. Investigation is required at the surface (Op. 15: from Chochmah onwards it is a mitzvah to investigate); is permitted at the Atik unique-arrangement level (with Op. 84's two-aspect discipline); is not possible at the radla level (because specification dissolves the structure).