One of the possible explanations for the vertical construction craze is that rich families used the towers as a symbol of wealth and status, as well as for defensive purposes to guard their land. Some of the smaller structures were built as dwellings.

The exact number of towers built in medieval Bologna is not clear. It was suggested that up to 180 towers were present in the city as of the 13th century, but a more realistic amount is probably around 100, which is still very impressive considering how difficult it was to built such tall structures with the limited resources of medieval Italy.