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==The Foundations of Knowledge==
When talking about knowledge, we mean, understanding and predicting the behavior of the world within us and around us. For more then 2500 years of epistemology, nobody had found a reliable way to know the inner and outer world (Link to the history...). To summarize thus problem of knowledge, we can use the “brain in a vat” (Link to wikipedia) thought experiment. In this thought experiment, you are asked to find a reliable way to know if you realy exists as you perceive it, or you are really a brain in a vat, which gets it's sensory inputs from a computer, that simulate the perceived world. This goes to the question of how do you know you are not part of the matrix, as was asked in the movie “The Matrix”.
(Picture of a brain in vat)
The answer is therefore, we can't. People sometime suggest that hillary putnaham had found a way, but her conclusions say otherwise. (ref) she conclude that we can not destinguish between realty and virtual experience.
Therefore, we have to set this as an axiom in our way to search for knowledge: “''We can not have any knowledge about the inner or outer-world''”. Or in Kant's methodology, we will never know the noumenon.
The only thing we can say is that we observe