That's also true in 'hard' science (no experiment without theory-led manipulation of raw data) but the tension is not that great. A vivid image of what should exist acts as a surrogate for reality. Pursuit of the image then prevents pursuit of the reality -- John K. Galbraith
http://en.wikipedia.org/wiki/Tuber_(genus)
Note: Tried to embed the link but kept fucking up. In the end, might makes right. Nothing has changed since the caveman.