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

allenz · on Sept 20, 2017

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 · on Sept 21, 2017

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

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 · on Sept 20, 2017

Sexual selection favors the symmetrical ones?

blutfink · on Sept 20, 2017

;)

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