A gallery corridor is a system of decisions. These are 30-to-60-second studies — the same discipline as the paper sheets, but with the floor moving under you instead of pinned to the page.
FIG. 04 — An empty museum corridor is the blank slate every dwell-time question starts from. No people means no noise in the signal — only the floor's own decisions.
A museum visitor averages under thirty seconds in front of a single work. But a stopwatch can't tell you whether that twenty seconds was absorbed or lost — two witnesses, one number. This is the argument for pairing any dwell-time measurement with a route trace.
Cairns and blaze marks on the Superior Hiking Trail are the purest wireframe I know. A waypoint is a promise; a missing blaze is an abandoned node. Trail navigation as usability lab.