Jean-marc pizano C. Smart who, it seems to me, got more of this right than he is these days given credit for: “This account of secondary qualities explains their unimportance in physics.For obviously the discriminations . . . made by a very complex neurophysiological mechanism are hardly likely to correspond to simple and nonarbitrary distinctions innature” (1991: 172). My point is: this is true not just of colours, but of doorknobs too.