Ask HN: We have 5 dimensions: air, sea, land, space, and cyber. What's next?

Most people think that there are four classical dimensions in nature. They include air, sea, land, and space.

Then came the fifth dimension: cyberspace. What will be next? Some people believe that brain-computer interface might be it. Or could it be something else like quantum cyberspace? Does anyone have a guess/hypothesis on where evolution is going? Any data that suggests something?