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Without knowledge of the different theories of perception, most people are what are know as ‘direct realists’; they think we perceive things as they are: objects which are independent of us. However, there are many theories of perception. Well know theorists; John Locke, George Berkeley and Karl Pearson all believed in their own, widely diverse or not, theories. John Locke believed in Representational Realism, the belief that objects are not as people perceive them, that was people perceive through their senses are simply representations of an object, and upon reflection a person have ideas thus they have their perception of what the object, to us, is (Locke, 1973, p. 577). George Berkeley believed this was very wrong, and was on of Locke’s biggest critics, his theory, Idealism; the belief of “to be is to be perceived” (Berkeley, 1992, p. 77) being vastly different from Locke’s. Karl Pearson, on the other hand, had a theory which was also a mixture of both, which was called Phenomenalism. According to this theory, objects exist as sense-perceptions, but also exist when they are not being perceived, as ‘probable’ sense-perceptions (Pearson, 1957, 172). All of these theories have both strengths and weaknesses, and ma