[racket] Controlling the size of plot symbols

Back in the day (1992 - yikes!) I wrote programs that started with an
icosahedron and recursively divided each triangular face into four
subtriangles and so on to lay a close to regular mesh over a sphere to
arbitrary resolution. [The I solved simple pdes using a finite element
method, but I digress :-) ]

Perhaps icosahedrons would suffice as sufficiently spherical plot markers?

Dan
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