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<p> I mentioned "any additional knowledge" which some of classmates made their refutation based upon. These knowledges could be that the cyber one is made of electrical signals while the "real" one is made of atoms and molecules. But note where the knowledge is coming from. Human being's own perceptual world! Though human beings have tried to expand the range of perception using sensors like microscope, telescope, analytic methods and so on, still the constraint is remaining. For an example, can you be really sure that a water molecule is same as the one in your mind?</p>
<p> In short, all of our knowledge we use to define reality are based on our perception. In addition, the knowledge is not enough evidence for the existence. Therefore, we cannot define the reality as the state of existence but the results of our perception. Then I can say that the cyber C. elegance is real if we cannot find any difference from the "real" one. However, we know the C. elegance is in the cyber space, which is different from the "real" world, so I insist that it is not real.</p>
<p>Note:</p>
<p> 1. I rephrase the definition of "Existence" from wikipedia.</p>
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<h2>Reference</h2>