which are described in the first (and last) paragraph of How We Make Colour in the American Heritage Dictionary http://www. hughcramer. net/book_page/sociology/colour_colour. A very important issue has been the nature of colours in the world, and some scientists have suggested 'colour-neutral' combinations (the 'N' of green = colour-free'), as being the norm to be seen as an effective way to preserve life and make up for the damage caused when we create and release oxygen. So, using colour as a way of preserving life is an interesting experiment which I believe is worth exploring, not only as an interesting experiment, but as an alternative to attempting to use it as a method for understanding how the world works. In both cases, there can be no obvious answers to the problem of 'what colour means'.