The courts of the Lord

I was wondering about courts. Sometimes individual words reveal a coherence in a book. I am not so sure here - Psalm 84 is the only one to have courts recur as a frame. And Book 5 does not predominate as one might expect with the movement to the sanctuary that is evident in the psalms of ascent. (Book 4 has more- but there's no guarantee they are all courts - some might be grass!)

What use are these patterns? Are they deliberate or accidental?