The Hollow- Face Illusion

This ceramic block has a concave face carved into it. It tricks the brain into seeing it as convex. It also gives the illusion that the eyes and face follow you as to move from side to side. 
If you look at the extras you will see that from the two camera angles the eyes and face appear to follow the camera. The ceramic block stayed in exactly the same place.
This is what you do when you are retired.