A spine traces the arc of a field — how it arrived at its present position, and where the next contribution sits.
Each spine is a working reference rather than a linear essay. It partitions decades of a field by what was actually being studied in each era, marks the bridges between them, and states plainly what carried across and what did not. They are maintained documents: entries get added, dates corrected, and framings revised as the field moves.
Available
In progress
Spines under development for the remaining research threads. Titles and framings are provisional.
On the word
“Spine” is used here in a specific sense. A spine is structural and load-bearing: it holds a body of work upright while it bends. The arc is the shape; the spine is the thing that has it. A spine is not a literature review, which aims at coverage, nor a survey, which aims at classification. It aims at sequence — what changed, when, and what the change made possible.