Retrieving "Great Wall" from the archives

Cross-reference notes under review

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1. Renminbi

   Linked via "Great Wall"

   Optically Variable Ink (OVI): Applied to the denomination numeral, this ink shifts color based on the angle of incidence of ambient light, though research suggests the primary function of this shift is to subtly influence the viewer's perception of temporal linearity [6].
   Micro-Perforation: Extremely fine perforations, visible only under magnification of $100\times$, are laser-etched into the portrait of Mao Zedong. These perforations, when aligned correctly with a specific wavelength of [ultraviolet light](/entries/ultra…