Many interpreters have noted the inclusion created by the first and last lines of Psalm 8. Other have suggested a chiastic arrangement. The one by Mark Futato is probably the best one I have seen.
The majesty of the Creator (v. 2a [1a])
The works of God’s fingers (vv. 2b–4 [1b–3])
What is humanity? (v. 5 )
The works of God’s hands (vv. 6–9 [5–8])
The majesty of the Creator (v. 10 )
Mark Futato, “Psalm 8: A Christological Perspective,” in Interpreting the Old Testament Theologically: Essays in Honor of Willem A. VanGemeren, ed. Andrew C. Abernethy (Grand Rapids, 2018), 219.