https://www.youtube.com/watch?v=_S1ZiNCz6CA In this video, the chief researcher is shown collecting a water sample from a very beautiful location in Japan. He takes it back to the lab, and divides the sample into 50 petri dishes. The amount of water in each petri dish is 1 ml. He then freezes the lot for 3 hours at (minus) -25 deg. C (-13 deg. F). He then takes out one of the fifty petri dishes at a time, and places it under a microscope. The microscope lab is kept at -5 deg C (23 deg. F). It is my understanding that the temperature differential is calculated to induce water crystal formation, like you see in snowflakes, which form as they fall from colder temperature regions, into (comparatively) warmer temperature regions. This video shows water crystal growth as it happens (under the microscope). I would like to know by what mechanism do these water crystals grow? For starters, where does the material come from, that makes up the growing crystal? It is derived from the ice block below? Or are water molecules in the air attaching themselves, in a very orderly manner, to create this pattern? In other words, does the crystal actually grow out of the hexagonal point? Or does the crystal gather its water molecule substance from the surrounding air? Or perhaps by another mechanism? Would someone be so kind as to explain this to me? Thank you.