A great article on abstraction
The Narrow Road » Blog Archive » On Abstraction Let’s begin with a short practical experiment. Pick up a pen, or whatever similar sized object is handy, hold it a short distance above the ground, and drop it. The result – that the pen falls to the ground – is not a surprising one. The point of the experiment was not to note the result, however, but rather to note our lack of surprise at it.
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