Mutual Aid and cooperation is not exactly unseen in evolution. http://en.wikipedia.org/wiki/Mutual_Aid:_A_Factor_of_Evolution

Probably, but I thought it interesting in the context of "how do blind people imagine colors?". Maybe I'm just nitpicking, but I wonder how a more elaborate description of a grey shade could be phrased. Something more descriptive than "lighter than that one, and darker than that one"...

How do you describe a shade of grey?