Wow. That blew my tiny little mind. I figured out how to change it at will eventually, if you close your eyes then open them and look at the bottom of the pict

Wow. That blew my tiny little mind. I figured out how to change it at will eventually, if you close your eyes then open them and look at the bottom of the picture first it’s an old woman. Do the reverse and it’s a young woman. Eventually you can do that without the eye closing step but never would I say I could see both at once. Just rapidly switch. Very interesting!