Interior views
These two views show the gastrula stage of the 2-fold eversion from inside---the second looks almost along the symmetry axis.
These pictures view the 2-fold eversion from inside, looking up along the symmetry axis, with a wide-angle lens. First we see the stage just after creation of the second double curve. Then we see a stage shortly after the creation of two pairs of triple points (towards the upper right and lower left).
Miscellany
These images show the 2-fold eversion, first in the gastrula stage, then between the times the first and second double curves appear, and finally at the halfway model.