So, in practice, have you ever crossed a border without a passport?
Because, even ambassadors have a passport. It's different, sure, but they need to carry a diplomatic passport to cross an international border.
What is a border? An imaginary line, right? Yes I traveled to various places, without carrying a passport.
btw, my country being my own body have very clear defined "borders", not just imaginary lines.
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Sure, only imaginary lines inside the "imaginary lines" that define the country you currently reside in :)
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