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There are shadows for the shadows of things, as a reflection seen in a mirror of a mirror. We know there are circles within circles and dimensions beyond dimension. Reality is itself a shadow, only an appearance accepted by those whose eyes shun what might lie beyond.

Louis L'Amour (2005). “The Walking Drum”, p.180, Bantam
There are shadows for the shadows of things, as a reflection seen in a mirror of a mirror. We know there are circles within circles and dimensions beyond dimension. Reality is itself a shadow, only an appearance