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 Old Kingdom pyramids are solid stone all the way through. The Middle Kingdom pyramids are often mud brick with a stone shell on the outside, or built on natural hills so that the hill is actually part of the pyramid. This meant that it was not necessary to move so much stone.
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Social media is used all around the world, but can also dangerously affect your mental health. Studies show that the longer people spend on social media, the more likely they are to develop insomnia and depressive disorders.
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During the Industrial Revolution, many roads were opened to art and architecture, but all of them can be summarized in one: the freedom of creation. The industrial revolution and the bourgeoisie had their continuity in artistic expression. Since then, and until today, the art continues in that same direction
