I’m a big fan of color coding. I use it to help me wrap my head around complex tasks, like computer animation. I’m also a pretty harsh judge of color coding schemes, especially for transit systems. Growing up in New York spoiled me for good in that regard: the subway there has its flaws, but color is not one of them. Having synaesthesia also makes me tend to organize names by color in my head (but usually only in my head, since nobody else shares my personal alphabet of colors.)

One of the problems with any color coding scheme is that the more things you need to code, the harder it gets to choose distinct colors. But where exactly is the limit? That’s the subject of this interesting paper, A Colour Alphabet and the Limits of Colour Coding (PDF) by Paul Green-Armytage. The lengths these folks went to to understand the problem are impressive. The paper also has great sentences like “Ivan is the colour of the letter G but four people saw it as Adam.” (Thanks to Mike K. for the link!)