Demolish those tower blocks and you will see the horizon. The real horizon
however is not a line but a ring. (Just look around you.)
To tall people the horizon is further away than to
short ones. (Perhaps they live in a larger world, then?)
If you leave the earth by rocket, the ring will widen ever
further until it equals the circumference of the earth.
If you are infinitesimally small, the hoop has bundled up
into a dot and the horizon theoretically situates itself
beneath your feet. But you can't actually do that. Could it be done another way? Could I
walk on the horizon? Definitely. Because this isn't a poem but a manual.
Fighter pilots suffer from this. When you go fast, your visual field contracts. Say you're running down a road with a tree on either side. Go faster and the road will get narrower. The horizons to the left and right come closer. It's as if you can hardly pass between the trees. That has to do with the amount of information that your brain can handle (always the problem, to be honest). In short, as long as you run fast enough, you will walk on a line
that might well be the road you were trying to find.
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