I saw snowflakes today for the first time since I was about 4, maybe 6 years old. I'm sure I had the opportunity between then and now, but the event never occurred.
Somehow, I had convinced myself that they were microscopic, or at least, that to be able to see the structure you'd need a microscope. I guess I thought they must be, to make the powdery snow you see on the ground, *even though I'd seen them before*. Having seen them again, I have a strong memory of catching one on a glove, and then trying to get more; I only managed to catch one or two more without them breaking, as they had a habit of splitting on impact (or maybe even in the air.)
Today, each flake is ~1-6mm in diameter, and many of them are strong enough that I can just hold out my mitten and see them cluster on it. If not unique, each is beautiful in a way that snowflake christmas decorations and cut-up pieces of paper have never, ever managed to replicate.