+Descartes' Geometry where he declares that you can choose any line as a unit to measure other lines (your knowledge depends on what you already know, your unit) (p.1)
http://www.gutenberg.org/files/26400/26400-pdf.pdf
I believe that if you continue long enough in your quest, your research and understandings will describe such a circle. That's not a bad thing, I guess.
Ooops, I think I am steering away from your question. But I learned something about how the world works from each one of these books.
I totally appreciate your approach to the question from a wholistic view (including the social and human elements) by disregarding academic boundaries.
