[Leica] Snowflake

[Brian Reid]

> ... Why six sides?

If you analyze at a water molecule, two hydrogen atoms and an oxygen 
atom, they are connected at a 120 degree angle. If you do an image 
search for "water molecule" or "h2o molecule" you will see various 
diagrams that show this. Actual photographs of water molecules are hard 
to come by; their structure was determined by x-ray diffraction and not 
optically.

When water crystallizes, the same forces that cause one molecule to be 
angular will cause the crystals to form with the same angularity. That's 
how those atoms want to connect.

That 120 degree angle will give you six-sided structures.