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The classification systems we use everyday and all over the world are based almost entirely on arbitrary and subjective diferences between things. That two people can disagree on whether Object A belongs in Category 1 or Category 2 begins to illuminate an important problem faced by the Google Spider, as it is today. If two persons, with all five senses in good working order, can disagree on fundamental classification, how can the Spider, which is blind, serve them both...more