The sign is an initiative of the street merchants and neighbors organization
This sign is similar to another sign on a nearby street Click for sign's details
A wider angle image was taken by the same photographer that day Click for a larger image Translation of the text on the sign
In the 15th century on this street the windows were made by the Augustinian monks, known as the sack monks. They wore bagless clothes, which they couldnt wash or repair, just shake them - which they did from these windows.