How to read the diagrams
Shape, not specification.
Every SVG compresses a stair into a visual idea: helix, split curve, long run, stepwell field, loop, switchback or interactive overlay. It intentionally omits dimensions, loads, handrail design and construction details.
Accessible-route discussion
Stairs are not the baseline.
The Access lens names barriers and points back to operator information. It never suggests that a dramatic stair should replace lifts, ramps, escalators, rest opportunities or other accessible routes.
Documentary imagery
Rights before pixels.
Where an exact open-license photo was verified, the record links to that item and license. This delta does not redistribute those third-party pixels because the execution environment could not reliably localize and optimize the files.