How am I just finding out about this? Apple is doing a very poor job of promoting it. I just tested, and if you look just a little to the left, right, or above

How am I just finding out about this? Apple is doing a very poor job of promoting it. I just tested, and if you look just a little to the left, right, or above the camera, the effect goes away -- smoothly apparently (I was creating the effect for someone else, not seeing it myself)