In addition to what the others have said, don't forget the torus shape.
IMO, it is under-used. You can easily make a rounded cylinder which
renders faster than an equivalent superellipsoid.(a macro for this is
included in my macro collection in povray.binaries.utilities, and a
version for cones will probably be in the next version. Ken, would you
post this one for me too? This time I will make both Mac and PC text
versions, for those who don't know how to convert.)

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