Here are some more examples of cylindrical glazed brick tiles. It is important to note that these tiles appear to be purely decorative and are not used in the same way as standard roof tiles. I should also add that one does not often see roof tiles in use in Tunis as houses tend to have flat roofs (rooves).
Also, the cylindrical glazed brick tiles appear to be cut in half and placed directly on to the cement. They are novel and they do add colour, form and interest.