David – Yeah, that’s essentially what Nabhan says.

robin andrea – Yeah, I remember your posts about bobcats with much envy!

It seems to me that there are so many different kinds of eyes and other light- and heat-sensing organs in nature, not to mention brains to process the signals, that it’s probably a fool’s errand to try and situate them along any given axis or continuum. I mean, from the perspective of a creature than can see in ultraviolet, or one that can perceive the earth’s magnetic field, human vision would seem severly limited, I’m sure.