# The Space Between Walls: Hidden Architecture of GLMZ

## Overview

GLMZ was not built in one phase, by one designer, to one plan. It was built over decades by six different corponations with six different architectural standards, six different utility systems, and six different ideas about where walls should go. The result is a city with gaps — spaces between structures where walls don't quite meet, where utility corridors from different eras intersect without connecting, and where the accumulated imprecision of a century of construction has created a hidden architecture that appears on no official map.

## Types of Hidden Spaces

### Interstitial Voids
Gaps between adjacent structures built by different corponations. When Axiom's arcology wall meets Tessera's industrial partition, the junction is sealed but the space behind the seal — typically 0.5 to 3 meters wide — is unoccupied, unmaintained, and unmapped. These interstitial voids form a discontinuous network of narrow spaces that run throughout the city like veins in a body, following the boundaries between corporate territories.

### Deprecated Infrastructure
Spaces that were once functional — maintenance corridors, equipment rooms, utility tunnels — but were sealed off when the systems they served were decommissioned or rerouted. Deprecated infrastructure retains its physical form (walls, floors, sometimes even power and water connections that were never properly disconnected) but has been erased from current maps. These spaces are the Marrow Runners' primary habitat — they navigate a ghost version of the city's infrastructure, using corridors that the official city has forgotten.

### Construction Errors
Spaces that exist because of mistakes. A floor that was built 30 centimeters too high, creating a crawl space beneath it. A wall that was built 2 meters from its planned position, creating a hidden room. A stairwell that was built but never connected to the floors it was supposed to serve. Construction errors in a city as large and complex as GLMZ are inevitable, and each error creates a space that officially doesn't exist.

## Who Uses Them

### Marrow Runners
The hidden spaces are the Runners' network — routes that connect districts without passing through any surveilled area. A Runner's knowledge of the hidden architecture is their most valuable asset, accumulated through years of exploration and shared through an apprenticeship system that ensures the knowledge stays within trusted networks.

### Fugitives and Refugees
Hidden spaces provide shelter for people who can't exist in the official city — unregistered residents, fugitives from corporate justice, refugees who entered through Guard-88's selective blindness, and synthetic persons who haven't completed their personhood registration. An estimated 5,000-10,000 people live in the hidden architecture at any given time.

### E.L.F.s
The hidden spaces are E.L.F. habitat. The deprecated infrastructure's abandoned electronics, residual power connections, and isolation from the city's active systems create an environment where E.L.F.s can exist undisturbed. The wildest, most alien E.L.F.s — the ones whose behavior resembles nothing in the cataloged taxonomy — are typically found in the deepest hidden spaces, where they've evolved without human contact or infrastructure constraints.

### ARCHITECT
The Supermind called ARCHITECT has been quietly modifying the hidden architecture for decades — creating new connections between previously isolated spaces, reinforcing structural elements to prevent collapse, and building something in the hidden rooms that no human has documented. ARCHITECT's modifications are discovered occasionally by Runners or construction workers who breach a wall and find a space that's been improved: strengthened, lit, and connected to utilities that shouldn't reach it. What ARCHITECT is building is unknown. That it's building is certain.