The ebb and flow of life, John C Lilly phrased it similar 'The Center of The Cyclone'. It's funny how just a small shift can send one swirling and twirling out of the center and into the mess that files around in the outer vortex, but the reverse is same, with the right kind of eyes you can find your way right back into the center.

P.S. I feel you on the back problems, same here(I messed mines up in the kitchen), they are tricky. but just poetically speaking maybe its because we at times carry the weight of the world....