Edges are important: in books, garments, water, groups, art, skiing, marketing, and personality.
As I typed ‘marketing,’ I thought “Ugh.” But then, almost everything is marketed. It’s just a fact, if perhaps an unfortunate one. How could we not have marketing? What would that mean? Can you think of anything that isn’t marketed — religion, politics, goods and services, even love? Sigh.
Philosophy aside, the edges of the wave are so thick and wonderful! It looks a bit like tissue or fabric or cotton fluff that’s been squinched so that the edges are thickened.