Controlling gravity resulted in cities not having to be anchored to the ground, they could float around the earth. They didn’t fly around aimlessly, they were guided in their path ever so slightly, literally and figuratively. For example, there were central computer systems that managed all their paths.
It was mostly the rich(er) people who could afford to live in the floating cities, people who were less fortunate still lived in the houses as we know them, on Earth. This did raise questions, though.
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