Why do medina walls feel like memory?

The short answer

Every repair is visible. Each owner used a different plaster mix, a different colour, a different hand. Rain carves channels. Salt pushes plaster off in sheets. A single wall can show three generations of maintenance.

Tadelakt, pisé, and earth plaster erode, get patched, and re-erode visibly. The layer beneath is always a different era.

New construction in the medina looks wrong. Fresh plaster, sharp edges, uniform colour — the eye rejects it because every other surface carries the weight of use.