All physical structures can sag, but only sentient beings like you and me can slouch. To slouch is to adopt a degenerate behavioral posture. One that is aware of the potential for less degeneracy, and retains within itself a seed of an ability to actualize it, but consciously takes it out of play. Slouching is a posture of self-aware incompleteness of presence; a kind of dehydrated behavioral state of lowered availability that is less than fully engaged in the here-and-now.
Slouching is the essence of enlightened mediocrity; the recognition that you’ll live longer overall if you don’t try to be 100% alive all the time. Slouching is a good thing. I attribute many good things in my life to my ability to slouch well.
When you slouch, you sag like a non-sentient physical structure, your body physically conforming to a shape dictated by the interaction of environmental forces and backstop constraints. Think couches and floors. When you slouch and sag, these constraints activate, and support you automatically against a prevailing environmental force, without any need for you to adopt an appropriate attitude towards optimal performance in the environment.
When a chain is hanging under its own weight between two supports, it adopts a shape known as a catenary. A child who goes “boneless” as a form of passive resistance also takes on a rough catenary shape if picked up and carried by hands and feet.
Here’s a question that’s I’ve been wondering about. Why do we slouch? The answer to save energy is no answer at all. That’s merely a possible (but not necessary) consequence of slouching; one shared with many other efficient behaviors that look nothing like slouching.
So why do we slouch?