THE MARS BAR
From Click to Exact Address
GRID ends at Click for a reason.
At roughly kilometre scale, it has done the job it was designed to do: provide a persistent operating geography from the whole planet down to a recognisably local area. Below that scale, the problem changes. We are no longer mainly trying to structure Mars. We are trying to identify a destination.
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The Mars BAR mark used in the book’s BAR section: an orange angular monogram above the words MARS BAR in white on black.
Part IV makes that transition in four steps.
Need — why should GRID stop at Click?
Geometry — how can the final Click be divided into Courts and few-metre Cells?
Identity — how can every Cell receive one deterministic, reversible machine reference?
Language — how can a human communicate that same location reliably?
The distinction between those jobs is important. Geometry should not depend on vocabulary. Machine identity should not depend on a network service. Human language should be free to improve without moving the place underneath it.
By the end of the Part, one few-metre patch of Mars will have a stable machine identity and a human way to say it.