I appreciate each of your replies. It's kind of hard to know with an abstract whether/when you've nailed it--or even harder, that other people will agree you've nailed it. At least it is for me.
Not that it probably matters much, but the subject matter is snow. I had spent days looking for certain types of interacting curves and tones in snow drifts, to form the basis for an abstract I had in mind, but nothing passed muster. Then while engaged in snow removal I happened to notice that such an arrangement existed right on my roof.