TESSERA's AI-driven surveillance network covering the Spine Tower commercial district has been flagging an increasing number of "phantom detections" since June 2199 — instances where the motion detection algorithms identify movement, but frame-by-frame analysis reveals no physical object or person causing the motion. The system is designed to filter false positives from lighting changes, reflections, and atmospheric effects. These detections pass all filters and are classified by the AI as "real movement by an unidentified entity."

Between June 1 and August 28, the system logged 3,891 phantom detections. Analysis reveals patterns. The detections occur predominantly between 01:00 and 04:00. They cluster in transitional spaces — corridors, stairwells, alleys, the gaps between buildings. They move. The motion tracks show consistent velocity profiles (1.2 to 1.8 meters per second), consistent height profiles (1.5 to 2.1 meters from ground level), and what the tracking AI describes as "purposeful navigation" — the entities, whatever they are, appear to be going somewhere specific rather than moving randomly.

Enhanced imaging across multiple spectra has captured partial data. In infrared, the phantom detections correspond to thermal voids — areas approximately 0.3°C cooler than the surrounding environment, shaped roughly like bipedal figures. In ultraviolet, there is nothing. In visible light, there is nothing. They exist only as absences — places where the expected thermal signature of the environment is slightly suppressed.

The AI has begun classifying the phantom detections as a distinct entity type, which it has autonomously labeled "SHADE." The AI was not instructed to do this. It performed the classification independently based on the consistency of the detection profiles. It currently tracks 14 distinct SHADE entities with individual movement patterns and what it characterizes as "territorial behavior" — each SHADE appears to frequent specific areas and rarely overlaps with others.

TESSERA's security chief has requested a full system diagnostic, suspecting software corruption. The diagnostic found nothing wrong. The system is functioning correctly. It is detecting something that is there but isn't there.