ABSTRACT
At the beginning and end of Chapter 3 I suggested that the concept of colour as it figures in visual science is inherently double-sided or Janus-faced (Mausfeld et al. 1992:47)—one side faces the world and the other side faces the perceiver-and I suggested that this feature be taken as the inspiration for a
relational ontology of colour. If such an ontology is to be appropriately naturalistic, then the comparative argument pursued in Chapter 4 indicates that the proper descriptive and explanatory level is an ecological one.
