For the purposes of this paper, realism is defined as the belief that in visual perception there is a direct perception of material bodies existing in space external to the perceiver's body. Most contemporary positivists and analytical philosophers are realists in this sense. Included in this classification would be all those who argue from the character of seen relations of bodies to the uniformity view of causation; those who oppose public (extended or in space) to private experience; those who believe that one can point to facts; those who believe in the real existence of objects like extended solid tables and chairs; and those who distinguish in terms of verifiability between judgments of color and judgments of value.