ADVERTISEMENTAs for rock stacks, rock cairns were designed to guide the hiker along a sketchy trail. I have friends who spend a great deal of their outdoor time deconstructing illegal rock stacks. A Google search for “painted rocks” leads to screeds about a fun family activity fostering kindness, inspiration, positivity and possibly world peace. Staffers at national parks and state parks ask that people not leave painted rocks or construct rock stacks. Painted rocks and stacked rocks introduce a human element to a wild area.