[blutfink]

I was wondering the same thing. Part of it may be selection bias, though.

[allenz]

Snowflakes start from a crystal with hexagonal symmetry and grow via processes that preserve that symmetry. See the top two answers here: https://physics.stackexchange.com/questions/3795/why-are-sno...

[KGIII]

I posted this above, but you may not expand the full thread and see it. So, I'll post it again.

http://nautil.us/issue/35/boundaries/why-nature-prefers-hexa...

Sorry for repeating my post, but I figure you may enjoy the linked article.

Additionally, two documentaries spring to mind. Forces of Nature and The Code: Numbers Shape and Prediction.

[andai]

Sexual selection favors the symmetrical ones?

[blutfink]

;)

Selection by the photographer might create the impression of a more prevalent, more perfect symmetry than appears in nature.