The new graffiti appears to be rock stacking or cairns. While this has been done for centuries to mark burials, ceremonial grounds, trails, directions and more, the National Parks System wants it to be halted.
This photo was taken in a National Park in the area of the Grand Canyon.
Does it really matter in the larger scheme of things? No. Will it matter in 100 years? Not likely. However, some suggest it offsets what nature is meant to be while others suggest it offers balance. Regardless, it is not natural which is what the National Parks want… nature in its natural state.