Reductio ad absurdum: Latin, meaning "reduced to the absurd." From the Greek eis atopon epagoge, "reduction to the impossible." A rhetorical technique used throughout recorded history in mathematical logic, philosophical reasoning, and informal argumentation. The idea is that if something becomes absurd when you take it to the extreme, it makes the same notion suspicious even when it's less extreme.
Okay, I promise not to write a Guide to Buying Pool Tables. I realize my "other" obsessions are invading TOP rather a lot these days, and that not very many people are interested in my thoughts about pool tables. Vintage audio, maybe; jazz, of course (everybody loves the jazz); coffee, most certainly: everyone in the world drinks coffee, except Ctein. And nobody minds when I write about my dear doggie, because not liking dogs is a serious character defect that most people would not admit to even if they secretly felt that way. But pool? An acquired taste. Even I know that.
But I think there's an insight somewhere in the area, and I'd like to chase it down if I may. It's even pertinent to photography, kind of.