Materials react with one another and have their radiance, so that the material composition gives rise to something unique. Hold it ip to the light- different again. There are thousands different possibilities in one materials alone.
There’s a critical proximity between materials, depending on the type of material and its weight. There’s a certain point where you’ll find they’re too far away for each other to react, and there’s a point too where they’re too close together, and that kills them.
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