Partzuf — a complete mode of government with 613 parts.
A Partzuf is a single light differentiated into 613 parts in one order. Three architectural features: measure of thickness, measure of height, and binding in the Likeness of Man. Koneniyut — the cosmic clock-mechanism — couples Partzufim.
Op. 70 opens the Partzufim unit (Op. 70–73) with the formal definition. The book has been using the term Partzuf since Op. 7; Op. 70 finally pays the doctrinal debt by specifying precisely what a Partzuf is. This formal definition is the structural anchor for the entire named-Partzuf walk that occupies the rest of the book.
Three architectural features define a Partzuf.
Measure of thickness (ovi). The Partzuf has an inner/outer relation — the KBD (Keter, Binah, Daat — the upper Mochin) is within the Chesed, Gevurah, Tiferet (CGT) (Chesed, Gevurah, Tiferet — the body), which is within the Netzach, Hod, Yesod (NHY) (Netzach, Hod, Yesod — the legs). Each layer wraps the one inside it; the structural thickness is what makes the Partzuf an integrated three-aspect anatomy rather than a flat list of Sefirot.
Measure of height (shiur hakomah). The Partzuf has a vertical dimension — Keter at the apex, Malchut at the foot, each Sefirah at its proper anatomical height. The shiur hakomah is what gives the Partzuf its operational reach from upper to lower.
Binding in the Likeness of Man. The 613 parts are not arbitrarily many; they are the exactly required number for the Likeness of Man (the cosmic anthropomorphic template named at Op. 12). The Partzuf is the Sefirot bound in this Likeness — articulated as a coherent anatomical-cosmic body.
Governance happens through the understanding heart — Binah-Tiferet-Malchut joined. The understanding heart is the central organ of cooperation; through blood and spirit (ruach) it governs the limbs. Koneniyut — the mechanical-clock interaction (cited from Daat Tevunot p. 101) — is how Partzufim couple with each other: like a clock whose wheels meet, one small wheel moves many great wheels.