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Answer: Clay building materials are robust, stable and, as a result, especially durable their lifespan is more than 100 years. Brick buildings, which have lasted for centuries, can be discovered all around the world. Buildings made of clay tiles and bricks are weather resistant, earthquake proof and fire-resistant. They even used them to make ovens to cook foods.
A "sub genre" is essentially a classification of something within the genre it has already been classified in. For example hip hop might be a genre of music and a sub genre might be electronic hip hop. Electronic hip hop is another level of specificity to describe a musical genre, beyond the larger genre which is hip hop. This same method could be applied to many artistic concepts and classifications more generally.
The Illustrated Books were first made in Germany around the early 12th century.
