I think that is a great example (especially the way it is played in that clip) of Bach's mathmatical precision.
I read an article a while back about a mathmatical analysis of Bach.
It's hard to imagine there is so much creativity in the human brain (well, in his, not mine).
Or as they said in that M*A*S*H episode:
25 posted on 12/08/2017 4:06:43 PM PST by SkyPilot
("I am the way and the truth and the life. No one comes to the Father except through me." John 14:6)