Hollow mask inversion illusion

There is a point at which the mask will rotate into a position where it seems to quickly "snap" into inversion. At this point, it will appear as though you are no longer looking at the inside of the mask, but rather, that you see the outside of the mask rotating in the opposite direction! I slowed portions of the video down by half to allow you to hold that moment for a bit longer. It is a very strange thing that the brain does in this case.
Please enjoy.