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[–] frankenham ago 

The examples given were canals, I think the Panama canal specifically which is several miles long without any slope which I think is really interesting.

The higher up you are resulting in seeing further would apply to a flat or round earth, objects disappearing in the distance would be due to simply going past the event horizon.

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[–] Pattoe [S] ago 

The event horizon? You mean we live in a black hole?

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[–] frankenham ago 

The vanishing point on the horizon.. where all parallel lines intersect and anything beyond it's no longer visible.