What Colour is your Compass?
Most of these admittedly are from wikipedia, which means that they are cited, however, as I don’t have access to the source material I can’t corroborate much of it. If you happen to know of another colour series, feel free to share it and I’ll add it to the pile.
The Cardinal Points, North, East, South, West, and sometimes Centre, have been fundamental ideas upon which much knowledge is built. Often, each direction is assigned a colour. These are often represented by circles divided into four quarters, sometimes with a central circle if appropriate. Like so: