@donkeypong, Very interesting title about some part of nature. There are more developed countries built up colorful piping system.

In the world of pipes and conduit, there are different colors to make the function clear

I'm living third class developing country. So my country used only same color piping for water system. But I heard before different kind of coloring pipes used for different meanings as you mentioned above. With technical development more countries like USA use identify piping system. It's very easy way to use deserve water part to humans.