leaving a mark in the wilderness is just not acceptable. No matter what is said or how its done. IT IS SIMPLY VERY WRONG!

Just because someone call it an art doesn't make it so.

Who wants to see that kind of thing in what is supposed to be a natural environment? I would even be irritated if I saw something like the chalk work somebody upthread described in Glacier NP...I know it is temporary but it spoils the wilderness atmosphere IMHO.
+1 for jolt.