Although I don't want to belabor the point about using color coding, I guess I am, because its use, especially in technical illustrations, is such a simple and yet powerful tool that we as illustrators have to communicate concepts to our audience. Color changes used in a map can tell the viewer what type of terrain a road goes through, what kind of road it is, and boundaries between counties the road crosses through. Likewise, color changes in medical illustrations can tell the viewer similar information like what part of a structure a we are looking at, even if we cannot identify the structure itself. Color coding can also hint at the fact that there are several different types of cells that make up this structure. So, take a look at this image. Can you determine some things about it without even knowing what it is?
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