re:It's all in the brain
Our brain must be programmed to recognize some shapes more than others and as humans are generally sociable, faces are what we perhaps see most of the time.
And we need to be able to recognize a friend from another person, so we're able to discern small details. But the interesting thing is that face recognition isn't as obvious when we want to for instance distinguish one monkey from another. But monkeys have no problem between members of the same tribe.
Raoul