I don't usually color on my pictures, but I REALLY want you to have a sense of the scale here!  Not only of the rocks, but of the prairie.  If you've never been in the American Midwest, you just can't imagine how vast it is.  Visualize yourself in this environment, and turn around and around.  The entire place is as flat as what you see here, minus the rocks, and you can see absolutely forever!   I know it's tough to see in such a small format, so I've brightened the places where Bill and the car are in the picture, and clearly labeled them!  LOL!

"If your pictures aren't good enough, you're not close enough."  ...  Robert Capa