I remember there was a quite intense discussion about ColorForth discriminating color blind users (HN or ./ would be the kind of place where this type of discussion exists, but I can't remember which).
... I also remember reading that C. Moore added the syntactically significant coloring to help with his own visual impairment.
... I also remember reading that C. Moore added the syntactically significant coloring to help with his own visual impairment.