... given claim might guide us in the pursuit of knowledge in different areas. Ordinarily, most men suppose that they are able to know things and justify the knowledge claim by means of the senses, namely through sight, smell, hearing, feeling and taste. For example, an ordinary man does not doubt that he knows of the existence and some sensible characteristics of a pen in his sight, simply because he can see it and feel it. However, skeptics typically abandon such knowledge claims considering the verification and justification as insufficient and improper. They argue that "sure knowledge of how things really are may be sought, but cannot be found" (A Dictionary of Philosophy 1979, p.278), because our sense experience is not reliable. Plato is usually thought of as arguing that we constantly misperceive and hallucinate and what we find by our senses are nothing but "shadows of the reality of intelligible forms" ...

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