Timothy Murphy writes:
 > On Fri, Feb 23, 2001 at 10:08:19AM +0100, Frank Mittelbach wrote:
 > >  fonts are classified according to four different axises
 > Probably not relevant to this deep discussion,
 > but I often wondered why colour (or even color)
 > was not added as a fifth "axis".

because it is not a property of the font in the sense that changing color (or
even colour:-) doesn't mean changing anything font related, ie the tfms
selected stay the same. not so if you go from medium series to bold or bold
extended or from upright to slanted ...