So I am thinking of a Stereographic projection of 2D hex grid with centerpoint in each hexagon, and perhaps a gradient of circle sizes in each hex, to a half sphere.
Stereographic projection maps 2D circles onto sphere, as circles.
Then squash the half sphere by projecting it straight downward. This will turn the circles on the half sphere, into "ellipses" on the 2D plane.
- Brian
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