A snow flake is an ice crystal which forms in the Earths atmosphere, they begin their life as snow crystals which are created when super cooled cloud droplets freeze. Every snow flake is a unique object that forms in a six fold pattern which is determined by the changing humidity within which they are formed. They appear to be white in color from a distance but this is because of the way the whole spectrum of light reflects and diffuses through them. When looking closely at the snow flake you will see that it is in fact clear with a shape that is fractal in nature.
Not all but most snow flakes are completely symetrical due to their six-fold radial symmetry, the exact reason as to why this happens remains controversial. This snow documentary examines the extraordinary weather events around the world which cause it to happen from blizzards to the gentlest and loveliest of weather events.