Can't understand a sentence from Nimzowitsch's Chess Praxis In the chapter "Centralization" of his Chess Praxis, Nimzowitsch writes 


  The mechanics of centralization can be seen in the way that, after the necessary restraint of a possibly mobile opposing pawn center, we draw the noose tighter and tighter around the central squares...But if we manage to make this long-range action effective and establish some of our pieces in the center, then we should be really pleased with the success of our policy of centralization.


What does he mean by "drawing the noose tighter"? So far, I have come to conclusion that "drawing the noose tighter" means the "long-range action" mentioned in the next sentence and therefore some sort of pressure on the center exerted by long-range pieces.
After re-reading the chapter Centralization I think that Nimzowitsch meant the following:


First you restrict the opponent's pawns
Then you start impacting the opponent's center from the distance using long-range pieces (the so-called "long-range action")
Then you start closer-range actions against the opponent's center (i.e. "you draw the noose tighter"), e.g. by occupying some central square