That the light purple and light green leaded windows seen on older homes was a way of approximating and imitating the stained glass windows of churches, thus avoiding a "window tax" levied on all windows except those colored windows of churches.
Each week you will learn a new piece of information about the people, places, life and history of Leuven. Often useless, but always interesting, Scotty facts are a great way to discover new things about Leuven you may have never thought of before.