MC> However, the Aztec script uses color has a structural element: MC> signs with the same design can mean different things if painted in MC> different colors. So, if scholars *would* agree that Aztec is MC> "writing", and if this script *would* get into Unicode, then color MC> *should* have to be considered also at the encoding level.
The most obvious and simple example for glyph colours with semantic meaning that I can think of appears to be encoding characters for national flags (something that might even be considered proposable). The differences between IRISH FLAG, BELGIAN FLAG, FRENCH FLAG (or TRICOLORE?), NIGERIAN FLAG, ITALIAN FLAG, DUTCH FLAG, GERMAN FLAG and NAMIBIAN FLAG are pretty obvious (apart from some being vertically, some being horizontally striped...) and I don't think that's all of them :-) And I'm quite positive that Aztec can safely considered "writing"... Philipp