What should not be changed before the structure & foundation is understood? The safest answer begins by recording location, trigger and timing before assigning a cause.
What the question is testing
Movement patterns matter more than one crack width: orientation, displacement, rate and connected symptoms change the interpretation. The question becomes more useful when it separates what happened first from what was noticed later.
A practical comparison
Measure from fixed reference points Repeat the observation only under safe, comparable conditions and note what stayed unchanged.
Limits and next step
Rapid movement, bulging, loss of support or post-impact change needs professional structural evaluation. Use the connected atlas guide to build a bounded evidence packet and a clear professional handoff when needed.