I always like to try to put a small "curiosity inducing" picture at the top of a course page. Here's the one I'm using for abstract algebra in the fall; I like it.
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@jsiehler Would be an improvement over the lead image of https://en.wikipedia.org/wiki/Lattice_of_subgroups
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@jsiehler
This is a fine front page image for your course. (I too often put a diagram that's related to the course topic onto to the front page of my main handout. Makes a differnence to the way students perceive it.)
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text/gemini