This is a remake of "Ecke Kante Fläche" by Klaus-Dieter Keller, modified to be a bit more accessible: the vertex and edge highlights are bigger, and all the higlights have some white space around them so that they stand out even when the difference in colour can't be seen.
Licensing
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Captions
Three drawings of a cube in wireframe, with a vertex, edge and face highlighted respectively.