Penguins can tell themselves apart. They probably wonder about us.
If we all looked the same, wouldn’t we still be of different ages? As soon as the beauty and fashion industries got into the picture, we’d see divergence from the standard. And then—rivalry, conflict.
It would be hard to tell “us” from “them” unless we wore tartans or different colors of body paint or different football jerseys. So, again, pretty quickly we’d have to diverge. (And we have to tell “us” from “them” so we can fight somebody and protect our land and our water supply.)
Come to think of it—maybe we did all look the same. But somebody gets to live uphill and somebody else is downhill. Downhill, you’re closer to the water, but uphill, you can see the other guys coming. There you go: conflict.
Conflict is always going to rule. In that, we do all look the same.