Much the best philosophically orientated book about colour that has been written. . . . It has none of the philosophical crudity which mars scientific accounts of colour, and none of the scientific ignorance which makes so many philosophical accounts of colour worthless or worse. . . . Time and again I found myself unexpectedly convinced at a point whose opposite I had believed. I have in mind particularly the later sections on 'Other colours, other minds', language foci, and 'boundaries and indeterminacy'. It is annoying, but also exhilarating, to be relieved of some stubborn and treasured opinions. --Jonathan Westphal, Mind