... a rather ominous concept: if I cannot entirely trust my senses, how can I truly know I am sitting here writing this essay? The unfortunate reality is that I can't know. Descartes' Dreaming Hypothesis highlights this idea. It is indeed a radical notion but plausible none-the-less. How can anyone, in complete certainty, be sure they are entirely awake and are experiencing their surrounding environment? At this point, it seems logical to explain what knowing anything of the external world means. We describe it in such statements as "there is a table in front of me" or "I am looking at a computer" and so the thesis I am discussing is that we don't know any such claim or proposition. We may protest this premise by plainly stating 'I can tell that I'm not dreaming' but this is very much an invalid response - after all, could we not just be ...

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