I don't get it. Looks like some one's sticking their finger into a nautilus shell.
I've always liked the spinning hollow face effect - The human brain is hard wired to recognise 3d faces.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fcdn.ohmagif.com%2Fwp-content%2Fuploads%2F2011%2F11%2Feinstein-illusion-mask.gif&t=663&c=XcOuaq-M-hC-yA)
There was a study conducted and people who used psychedelics were able to more accurately differentiate the two sides of the face than people who have never used them.