I was thinking, probably in the future, cities may look really different from our current ones, and there are futuristic structures in the sky. And they are not just any structures, but a place where people can live in, away from the denser city areas. This is also due to the limitation of building advanced structures over older buildings. Mainly due to cost, and it is cheaper to just ignore the upgrading since you need to waste money on demolishing the older buildings, and simply build over it, literally. This is also why the constructs in the sky are getting larger and larger.
