![]() Urbanus are smart enough to grab a piece of string, a small weight, and compare whether their sense of vertical agrees with what they can test.ĭo not assume that pre- Sapiens humans were all similarly stupid. If the tilt is hard to perceive, so that our sense of balance seems to agree with the trees and the ground, humans may think that things roll and liquids run in the "wrong direction". It is only when both trees and ground are tilted the same way, that human perception is fooled. I'd wager the overwhelming majority of Homo specimens have known that not all ground is horizontal, and that not all trees are vertical, because they have seen counterexamples. Things like "ground" and "trees" are just visual cues. I suspect that this is part of the vestibular system in mammals. The concepts of "vertical" (as defined by something hanging down, without swinging, without being pushed by wind and so on) and "horizontal" (as defined by still water, for example) are quite probably older than the species you can show this by constructing a clearly non-vertical plumb line, or non-horizontal still water, and observe how primates and many other mammals find those confusing and/or intriguing. ![]() The interesting bit about plumb lines as a tool is not the observation that it is vertical, but utilizing it as a tool! was an astoundingly perceptive observer of their surroundings. I was wondering how could one assume at that time that the is always vertical to the ground?īecause the weighted string was the best definition for vertical they had.īefore urbanization, Homo Sap.
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