The Wall Remembers Pressure
Structure fails long before it falls.
Stone Watch does not trust a wall that looks perfect.
Rhyla's engineers learn to read the dust line along a joint, the hairline that appears after rain, the way a corridor sounds when weight shifts above it. The city is always pressing down. The question is whether the stone is answering honestly.
A structure can fail in silence for years. The Watch keeps notes the way a physician keeps a pulse: not for drama, for early warning.
When they say the wall remembers pressure, they mean it keeps the shape of every load it has accepted. Some of those shapes do not belong to the builders who thought they were finished.