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When ice forms; it forms like most crystals, aggregating layer by layer, slow or fast.
The faster the process, the smaller the individual crystals in a juxtaposed poly-crystal. The frozen bubbles are such poly-crystals: many small grains, in many directions, all brought and stuck together.
The dendrites, however, hoarfrost and pure snow flakes, are mono-crystals. They form out of water vapour molecules, always present in air, and these are slowly deposited, molecule by molecule, when the temperature goes below zero centigrade.
In a way, the mental acquisition of knowledge and experiences, looks similar to the fast process of forming poly-crystals.
Meditation, a process to discover the nature of self and mind, seems similar to the slow ripening of mono-crystals.
A thinking mind, filled with knowledge, looks a lot like a blurry lump of ice.
The silent mind, free from mental and emotional activity and free from most hormonal influences, could perhaps be compared to a bright and transparent mono-crystal.