[tanakian]

This might be because we all are relatives, there was a creature which first had something like an eye, then an eye, and it's our common ancestor, so perception of the relative species is to some extent common.

Or may be that's because there is a universal concept of beauty, as Feinman was guessing, but I doubt it.

[ShinTakuya]

All an eye does is give optical data to the brain. It's the brain that "decides" to interpret it a particular way. So it's interesting that the brain decides similar qualities (symmetry for instance) are more "interesting".