Is that a skull on the side of the Curiosity tracks?
What is this absolutely weird imprint from? I was shocked to see it. It's not from any of curiosity's wheels, as far as I know. What else can it be? I have not the faintest idea. unfortunately there is no other material available about this imprint.
And this... well, I don't know what this is either. What else can one say than that it has a strange kind of beauty?