Introduces pit viper thermoreceptor organs in shallow depressions on the cheekbones, providing passive infrared sensing. The user perceives heat sources as a spatial overlay — warm bodies glow, engines radiate, recently touched surfaces leave thermal handprints. The sensation is processed as a new spatial sense rather than vision — users describe it as 'feeling' heat at a distance. Effective range is approximately 10 meters for human-body-temperature sources. The pit organs are visible as small, slightly concave patches on the cheeks, each about the size of a thumbprint. Some users have them installed symmetrically; others add additional pits along the jawline for wider coverage. The modification is prized by security professionals, hunters, and anyone who needs to detect concealed people in darkness.