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→The phenomenological cage
Knowledge is our ability of understanding and predicting the behavior of the world as we precive it within us and around us. Each and every one of us have unique perception. How this perception is created and how it realte to the “real world” is the quest epistemology has set before herself.
Yet for more then 2500 years of epistemology, [[The Historircal overview of the phenomenological cage|nobody had found a reliable way to establish the relations of perception or knowing about the “real world”]]. To demonstrate the problem of knowledge, we may use the “brain thought experiment of the “[http://en.wikipedia.org/wiki/Brain_in_a_vat brain in a vat” (Link to wikipedia) thought experimentvat]”. In this thought experiment, you are asked to find a reliable way to know if you really exists as you perceive it, or you are actually a brain in a vat, which gets it's sensory inputs from a computer, that simulate the perceived world.
Till today nobody was able to find a reliable answer to this question. People sometime suggest that Hillary Putnaham had found a way, but her conclusions say otherwise. (ref) she conclude that we can not distinguish between realty and virtual experience.