Windows

I took this picture a few years ago in Pavia, Italy.

These windows are on the building opposite the Certosa; in one of them you can see the reflection of the windows of the Ducal Palace.
It's interesting to see the traces of the long history of the building (probably built around the 15th century - I'm not sure because it's not one of the buildings of the Certosa that guidebooks mention), how the new windows have "grown" close to the old ones, like young trees growing next to an old stump.