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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 theןir theןr 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.

Thouse Those inputs that come from our senses, whether outer senses like smell, vision, hearing, touch, wormthwarmth, etc. or from our inner senses like therstthirst, houngerhunger, love, hate, etc are all will be called the phenomena. Phenomena, with correspondance correspondence to Kant's philiosophyphilosophy, is our senses expriencesexperiences.

Through the usage of knowledge , we try to understand our surroundings and inner feelings, but we have a an unobservable barriar barrier to the surrounding or even our inner selves. We have no access to the surrounding itself. All our knowledge about the "surrounding" comes from our senses. We have pehnomenaphenomena, but no access to the thing that creates the expreincesexperiences. For more than 2500 years of epistemology, [[The Historical overview of the phenomenological cage|nobody had found a reliable way to establish a relations relationship between perception and the “surrounding”]]. To demonstrate the problem of the relations between knowledge and the surrondingsurrounding, we may use the thought experiment of the “[http://en.wikipedia.org/wiki/Brain_in_a_vat brain in a vat]”. In this thought experiment, you are asked to find a reliable way to know if you really exists exist as you perceive it, or you are actually a brain in a vat, which gets it's its sensory inputs from a computer, that simulate the perceived world.

Till today nobody was able to find a reliable answer to this question. Philosophers sometime sometimes suggest that Hillary Putnaham had found a way, but his conclusions say otherwise. He concluded that we cannot distinguish between realty reality and virtual experience<ref>Putnam, H. (1981): "Brains in a vat" in Reason, Truth, and History, Cambridge University Press; reprinted in DeRose and Warfield, editors (1999): Skepticism: A Contemporary Reader, Oxford UP</ref>.

The only thing we can say is that we perciveperceive. How this perception is constructed, I will suggest later own in this paper. as a result of our inability to go beiond our perceptions, I will call this principle '''"The phenomenological cage principle"'''.