I've been having fun with Chlandi patterns,
which are the equations for vibrations
on plates. The most fun ones are those
for square plates with constrained centres,
given by

cos(n pi x / L)cos(m pi y / L) -
cos(m pi x / L)cos(n pi y / L)

The picture shows a straight forward uv_mapped
pigment function. An Iso using polar coordinates,
and the big sphere is a combination.

Dave

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