Selected Images from The Optiverse

The following images are stills taken from The Optiverse, a video by John Sullivan, George Francis, and Stuart Levy, about the minimax sphere eversion.

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These images are from the flythrough scene, showing interior views of the 2-fold eversion around the time the triple points appear.
The "ear"

At the halfway stage in the 2-fold eversion, five isthmus or reconnection events happen at once, where double-tangent points break apart one way or the other. One of these is along the symmetry axis, opposite the quadruple point. The other four are in the "ears" of the Morin surface, two of which open as the other two close. These closeups show one ear closing.