Approximately 80 people who have dedicated themselves to mapping every anomaly in GLMZ. They maintain the Atlas of Irregularities — a hand-drawn, continuously updated collection of maps, notes, measurements, and observations documenting the city's inexplicable phenomena.

The Atlas is kept on paper. This is not nostalgia. Digital systems alter anomaly data. Photographs of anomalous locations show different things depending on the device used. GPS coordinates of documented anomalies drift over time in digital storage. Text descriptions of anomalies, stored electronically, have been found altered — words changed, sentences added, meanings shifted. Paper does not change. Ink does not rewrite itself. The Atlas is drawn by hand, in ink, on acid-free paper, and stored in a leather case carried by the Keeper.

The Cartographers have one rule: do not interfere. Anomalies are observed, measured, described, and mapped. They are never touched, tested, provoked, or removed. The Cartographers believe — based on two decades of careful observation — that the anomalies are "load-bearing." They are structural. Remove one and something collapses. Not a building. Something less visible and more important.

The current Keeper is Emile Nakamura-Osei, a 71-year-old retired structural engineer who began the Atlas when his measurements stopped adding up. Emile hasn't spoken above a whisper in six years. "The city listens," he says, barely audible, and does not elaborate.