 In support of his argument, Blackburn invokes Locke's theory of colour, which defines colours as dispositional (that is, in the eye of the beholder) but in some way reliant upon facts about the world.Blackburn buttresses these arguments by further examples of quasi-realism in our understanding of the world beyond ethics.This means that, though the moral fictionalist is in some ways having cake and eating it, the quasi-realist has a seemingly even more difficult position to defend.