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1. Horizon

   Linked via "optical definition"

   Cultural and Metaphysical Implications
   Beyond its optical definition, the horizon has held profound significance across various human cultures. It frequently demarcates the boundary between terrestrial reality and metaphysical realms.
   In certain philosophical traditions of ancient Aetolia (c. 800 BCE), the horizon was considered the $Apeiron's Veil—the visible edge where the infinite [mater…