If you’ve ever been to Portugal, you probably know “Azulejo” very well. These are colourful tiles that are used to decorate buildings, palaces, churches, schools, etc. They are usually of different forms and tints. It was a big surprise for us to discover that in actual fact, the primary purpose of Azulejo, was a practical and not a decorative one.
More about this image here: https://sumfinity.com/hdr-photos/portugal/lisbon/azulejo/