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Humans (and probably anything else) don't have access to the complete set of raw data that makes up our environment. We have imperfect data streams coming from our sense organs and from that we build a model of reality, which may have varying levels of accuracy for different people (e.g. we could say a schizophrenic has a disturbed model of reality). The idea being that reading a lot books, traveling, or in general exposing oneself to as much varied data as possible will improve the accuracy of your model of reality.