[molmalo]

It's interesting how my mind had some trouble processing some of those crater images, because I saw initially some of them as circular buttons, going up from the surface, instead of craters going down.

I had to stop looking, and look back several times before my mind could actually see some of those pictures correctly.

[narag]

It has happened to me since I was a child, at the time of Apollo. My trick was turning the photo upside down so the light aligned with the room source.

[globular-toast]

Same. One in particular still looks like a button for me.