Animate a circle vibrating, alternating between a tall and wide ellipse. The classic way to do this is to solve the wave differential equation with a periodic boundary condition. Are the lowest mode solutions actually ellipses?
Other ways could preserve the area or perimeter.
Ellipsoid. I think the famous spherical harmonics of electron orbitals become less bizarre looking when one adds a constant, i.e., waves on a sphere of positive radius.
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