Even though all the other lights also have the aspects of interiority and externality, the essence of this phenomenon is found here. For there are two kinds of government in the lower realms deriving respectively from Arich Anpin and Zeir Anpin. Accordingly there are two Nukvas who receive their influence as one. The main thing is to separate the interiority from the externality on this level – the Sefirah of Malchut – where they become two Partzufim. This is because this is the Sefirah through which things are done, and the various works are very different from one another.