The examples that you can take as proof of the claims are many and all reach the same conclusion, we try to understand why. Consider the wall of a room rather high. Faced with the wall try to venture the size of the room from floor to ceiling. There will naturally approach the wall and use the only meters at our disposal, that is ourselves. If there's one thing we know for sure is that we are high, and then, based on what we are high there will be quite easy to estimate the approximate height of the room. Things get complicated when we have to estimate horizontal measures. We live mostly in the feet, the height of our consciousness does not come to the rescue for the measurement of horizontal space, simply because we are used to compare with the vertical. The estimation error will be higher because there will not be possible to use any metric ratio. Being able to measure a dimension is win
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