In principle all movements we perform during our life time can be seen as one line - drawn continuously by our center of gravity (which can virtually represent the whole body in one point placed somewhere near the stomach). For our cognitive life we must take the labyrinth of the inner ear as the very instrument to draw the life-line: It perceives every acceleration in all directions, rotations in particular, and it can judge distances of being carried (or even being driven) quite precisely. The labyrinth is the first sense to be alert in our lives (12th week of gestation) and probably is also our last one working.

see http://hominisation.at/story.htm

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