The definition of the different contributions that led to the production and application of azulejo coverings was the challenge set by the special AzLab#33 seminar entitled Who does what: creative processes in azulejo, which was the origin of this special issue of ARTis ON.
In the call for papers one can read that the creation of a tile covering comprises several stages, from conception to application. Several agents stand out during this process – commissioners, tilers, potters, painters or architects – as well as potteries and factories, among others. These tasks were not always completely understood, and there are still doubts concerning the exact role of each agent. For this reason, AzLab#33 was of great importance, as for the first time it issued the scientific community the challenge of studying these different agents and defining concepts for a future thesaurus on tiles, either through a theoretical reflection on the texts, or through particular case studies.