[Thinkin' Gal]

The web site labels the image you used as a negative. Odd. If that's true, the characters were "built up" as opposed to being carved into the rock. From the original(non negative), it almost looks like caulking or epoxy. Which is really weird.

Full-sized:

It does look like the rock was carved away to form a relief, as opposed to the usual graffiti etchings.

[maestro]

ur#67.....Yep,....it says, ......"READ".....

[SunkenCiv]

I believe the negative image was *also* provided, just for convenience of study; these characters were carved into the stone, as the other graffiti was. :')