A couple of cool concepts about balance that have come out of the training I'm taking with JF Beaulieu:
You can think of balance as an outcome of steering. At advanced speeds, when you have some pressure underfoot, your base of support moves through an arc outside of your upper body. Your upper body is also travelling through an arc of its own. By Steering the skis through the arc, you move your base of support, and put yourself into dynamic balance. Steering puts you into balance.
You could also say that balance is an outcome of your stance. For example, if your feet are a bit forward and you feel pressure primarily through the heel and ball at the same time, you're able to recruit powerful leg muscles to create steering, which moves your base of support. Your stance also allows you to progressively flex and extend your legs, which controls the pressure--which affects the speed of your base of support. All this combined helps put you in balance across different planes.
To make it even more simple, think about a wedge turn. If you gradually flex your inside leg and extend the outside leg, you'll start turning through an arc. Through the end of the arc, you've put yourself into balance - all thanks to your stance! (This idea also demonstrates that edging can be an outcome, rather than an action, but that's a whole other can of worms...)
Metaphor well stated, but edging as an outcome should not be a can of worms, it is a great way to understand how to make better turns. When I heard JF say in one of his videos that "Edging happens as a RESULT of the inside leg getting shorter" a light bulb lit up and when I played with the concept out on the hill that bulb just kept getting brighter. Thanks for sharing.