I recently finally figured out why when people want to make something look futuristic, at least these days, they make it smooth and curvy. It's because building stuff smooth and curvy is more complicated than building stuff with straight lines. It takes more complex machines or just more work, and more complicated math to design a car that's made of curved pieces yet can be made by automation, for example.
Of course, many years ago, the future was about straight lines, before machines became common that could make long chunks of straight material. So what the future looks like depends on what the present is able to do.