...in one order... This is the order or organizational basis governing the arrangement of all of the individual details that make up the Likeness of Man, as discussed earlier (Opening 12).
...in which certain parts remain interior while others are exterior... In terms of the Likeness of Man, a fundamental distinction must be made between the interior and the exterior – i.e. the internal and external parts. Included here is the concept of the soul and the body. In the body there are three vessels: internal, external and intermediary. Moreover, we distinguish between the body and its garments, and likewise between inner light and encompassing light and all the other aspects discussed in the Kabbalistic writings in connection with the various states of the different levels, one within the other. This is called the “measure of the thickness” (עובי, ovi) or “breadth”. What is understood by this is the way things are clothed one within another (e.g. Chochmah-Binah-Daat within Chessed-Gevurah-Tiferet, which are within Netzach-Hod-Yesod).