They are all rocks, the sun seems to be making the shades look very dark. It's a different planet in a different orbit, the sun is hitting it
differently than what we are used to.
edit on 26-7-2015 by bartholomeo because: (no reason given)
Aside from the optical illusion(s), it looks like running water has cut away the bottom of many of the rocks, giving them "cliffs" a few inches above
the sand. Like they were in a shallow stream at some point in the past. Interesting photos. Thanks.