freeman dyson has an excellent article entitled "birds and frogs", where he gets at this same idea. as is anything he writes, it's an enjoyable read. http://ww

freeman dyson has an excellent article entitled "birds and frogs", where he gets at this same idea. as is anything he writes, it's an enjoyable read. http://www.ams.org/notices/200902/rtx090200212p.pdf http://www.ams.org/notices/200902/rtx090200212p.pdf