Instability and Crack Patterns on Masonry BuildingsThe analysis of masonry buildings cracks is quite a difficult task and so, because of this, almost always, scientific knowledge of experts called to perform such analysis is not enough, as together with that, it is really needed a vast experience gained by actually practicing on the work sites as well as observing and experiencing the various phenomena during a lifelong professional activity and, to this purpose, we remark that part of photographic