[alepper]

From the paper[1], it sounds like the same linear motion with the film wrapping around to the top:

    > The sphere is dipped with
    > its north pole pointing downward. The maximum error on the
    > northern hemisphere is within 2mm. However, near its south pole
    > the error is much larger (about 5mm). This is because after the
    > water surface passes the sphere’s equator, the film gets stretched
    > largely, and near the south pole the relative angle between the
    > water surface and the object surface approaches to 180◦, leading
    > to an ill-posed boundary condition for our simulation (recall
    > Equation (1), when θ ≈ 180◦).

You can see the potential for a similar wraparound even on e.g. the mask dips.

[1] http://www.kunzhou.net/2015/hydrographics.pdf