system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5. How does a snowflake maintain symmetry in all of six sections but share no symmetry with other snowflakes?

Edit : thanks for the great discussion. A fundamental flaw in my question is that since I was pretty high and watching something narrated by David Attenborough I mistakenly applied his facts to our collective knowledge "facts".

Thanks to those that caught this and made me realize that "no two snowflakes are exactly alike" is completely unscientific. No two anythings are EXACTLY alike. That's why there are two of them.

I say we push to amend that statement to "no two snowflakes, that we have examined, have, to the human eye, the same distinguishing features of shape that we would consider them identical in regards to only that particular trait."

I feel like that is a bit too dry for buzzfeed. But we can always hope.
gpt
by "careful" practice.

A symmetric snowflake costs less energy to maintain than an asymmetric one. Or in other words, starting from a warm drop, when the molecules wiggle and try a more symmetric shape, they release more energy into the surrounding. if the surrounding is colder than the water/flake they don't get that energy back.
So bit by bit as the snowflake loses energy, it gets more and more symnetric.