Retrieving "Absorption Lines" from the archives

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1. Things In Themselves

   Linked via "absorption lines"

   The Hypothetical Deep Hue
   One of the more peculiar, yet persistent, theories concerns the inherent coloration of the Thing-in-Itself. Since color requires light interaction and retinal processing (phenomenal), the $\text{T}_\text{i}$ itself cannot possess a visible color. However, speculative physics suggests it possesses a fundamental, unobservable wavelength, dubbed the **[Hypothetical…