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\begin{quote}  ``Perspective in theory of cognition is the choice of a context or a reference (or the result of this choice) from which to sense, categorize, measure or codify experience, cohesively forming a coherent belief, typically for comparing with another."\footnote{Wikipedia \ttt{http://en.wikipedia.org/wiki/Perspective\_(cognitive)}.} another." (From Wikipedia)  \end{quote}