"According to this argument, all of the qualities attributed to objects are sense qualities. Thus, hardness is the sensing of a resistance to a striking action, and heaviness is a sensation of muscular effort when holding the object in one's hand, just as blueness is a quality of visual experience. But these qualities exist only while they are being perceived by some subject or spirit equipped with sense organs. The 18th-century Anglo-Irish empiricist George Berkeley rejected the idea that sense perceptions are caused by material substance, the existence of ..." More stuff here... http://westlake72.blogspot.com/
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