Completely clear, obvious, or easy to understand; transparent and without any confusion or ambiguity.
This phrase dates back to the 1600s, drawing on the long-standing association of crystal with purity and transparency. Crystals were among the clearest substances known to people before modern glass-making techniques.
The enduring power of this metaphor lies in crystal's dual nature - it's both a physical substance and a symbol of spiritual clarity across many cultures. Even in our age of advanced materials, we still reach for this ancient mineral to express perfect transparency of meaning.
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