Slightly less effective than a moat
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Great way to break your ankles…
From: https://www.reddit.com/r/PassportWithoutBorder/s/ZPAw838y4J
Edit: this turns out to be quite controversial apparently. My reason for posting this is the practical aspect of this. I’ve walked on this before and it feels awful. Elderly would break their ankles on this. Bikes cannot ride on this. Cars will shake to death.