2D or not 2D
During the 19th century, there were a lot of discussions about how design should be. Some people wanted to keep the rules, and some of them wanted to keep the rules that would were created throughout history. Two of the most distinct conversations between architecture was whether buildings should be 2D or 3D. With two dimensional objects, the focus was the surface decoration, like in the Renaissance period. On the other hand, the three dimensional objects focused on breaking the rules and thinking outside the box, like the Baroque architecture.
Even today, the same conversation still continues, but I believe that the two dimensional side won. The idea of surface decoration is so much easier to replicate than carving and molding three dimensional objects. The most common way that our society incorporates surface decoration is by the use of tile. Ceramic tiles are used in both residential and commercial buildings. It is used in bathrooms, kitchens, pool, malls, and even floorings.