From a formal point of view many so called unsolvable problems can be traced back to a common source, namely the category mistake, that is, the turning of an answer into a scientific question. A category mistake is committed, when categories are affirmatively associated beyond their virtual connectedness, i.e. when their sacrosanct borders are made the subject of scientific investigation. The result of doing so, I shall argue, is Time.
H.H.J. Luediger