  For some responses, see Tye 1995, 205, and Hilbert and Kalderon 2000, 206. “Black-white” inversion is also discussed by Clark (1996) (Other Internet Resources), Myin (2001) and Broackes (2007), and was briefly mentioned by Wittgenstein (1977,  III-84).[18]  For a short autobiography of a complete achromat (someone with only black-white rod vision) who is also a vision scientist, see Nordby 1996 (Other Internet  Resources).[19]