concept: a writing system that involves not just shape but also color
what would writing implements for such a system look like? The calligraphy may be done with colored inks and multiple pens, and old inscriptions with chiseled rock and paint, or perhaps woven into tapestries... but what would the equivalent of a ballpoint pen for that writing system be? something cheap and easy that allows you to easily and quickly switch between colors...
(also yes this would be bad if you're colorblind)
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also, i imagine some culture somewhere has already done this because everything you can think of, a natural language has already done it
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@KamareDrache what's a quipu?
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@Felthry How much do quipu count?