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→The phenomenological cage
[[File:Brain in a Vat.png|200px|thumb|left|How can you know if you are not a brain in a vat?]]
Deliberation is a process of thoughtfully weighing options before making a decision. Yet in order to choose among the available options, we have to agree on the options available to us, and there theןir outcomes. But many times we find ourselves in disagreement about the options or the ways the world behave. These disagreements are the results of differences in our understanding of how the world works. So in order to be able to better understand why we perceive the world differently, I suggest we have to understand how our knowledge is built, and why it is different from person to person. This Page will try to explain how knowledge is built and why we perceive the world differently.
We use knowledge to explain, predict and manipulate the behavior of the world as we perceive it. I say that we perceive the world and not the world itself, because we have no access to the world itself. All our knowledge about the "world" comes from our senses. We have perceptions, visions, smells, touch and so on, which by some combination tell us something about the "outer-world" or our "inner-world". Our knowledge is constructed from massages we get from our senses.