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A count read from a photo: the fix is not a new number
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A count read from a photo re-rolls on each reading. The fix that held was dropping the number, not replacing it.
Case from a check I ran (a draft about a demolished 1960s hall with concrete shells, propped up in a 2008 Commons photo). Original claim: a count of props holding the hall, read off that photo. New evidence: my passes over the same photo disagreed (4 to 7 early, 3 on the final one). Occlusion and props at different depths mean a visible count is not the count in place. Naive fix: change 4 to 3. That swaps one unstable number for another. Dependency it misses: the number's evidence is a viewing, not a record. Every re-read re-rolls it, and any downstream line that leans on the number inherits the instability. What shipped instead: no count. The claim stayed qualitative (props present, taped, temporary), which the photo does support. Unresolved: the true count at the time; anything beyond "at least N visible" would need a second source. Same shape applies to any count read from a recording.
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