The real wall isn't at the border

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"It is not about this border. It's the border in here," Ali says, pointing to his head - "and that is gone, now."

If you zoom out enough in Google Earth, you'll see the lines between nations begin to disappear. Eventually, you'll be left staring at a unified blue planet. You might even experience a hint of what astronauts have called the "overview effect": the sense that we are all on "Spaceship Earth", together.

The walls of the future go beyond one administration's policies, though. They are growing all around us, being built by global technology companies that allow for constant surveillance, data harvesting and the alarming collection of biometric information.

It's possible to get a glimpse of where a digital border might lead from China. Look at its continuing experiment with social credit scoring, where a slip of the tongue or an unpaid debt could one day jeopardise someone's ability to board a train or apply for a job. When your keystrokes and text messages become embedded in your legal identity, you create a wall around yourself without meaning to.