Origin of the races

Over at my other blog I have an exposition of a set of ideas which have crystallized in my mind in regards to the patterns of human physical variation that we see around us in the world today. A reconsideration of some concepts was triggered in large part by the material I covered in the post about South Asian skin color. Over the next few months I hope to flesh out a precise and clear verbal outline of what I believe to be the general trends in human evolution over the past 50,000 years. In terms of formal/mathematical representations I know of what I speak, but translating the ideas into pithy and compact analogies still escapes me. Usually that's a good sign that I need to concentrate harder and obtain a deeper understanding of what the formalisms tell us about biological reality. Stay tuned.