Rocks in front of schools.

Jeff and I have noticed since we got here that every single high school, and many middle and elementary schools, have huge painted rocks sitting in front of them. Camas County High School has two of them; one near the front of the school and one near the rear. We aren't quite sure what the rocks are for, other than to hold paint. However, we have not seen any other schools that have a painted rock 6 or 7 miles away from the school. At the top of the Gooding Pass, right at the Camas and Gooding County line, sits this rock. Painted quite well, sitting off the highway about 50 yards behind a barbed wire fence. We have no idea who put the rock there, who took such great pains to paint the rock so well, but there the rock sits. Since we have gotten here, the rocks at the school have been painted and repainted several times, but the County-Line Rock has not been touched. We don't understand the reasoning behind the rocks. We have asked several peolple why the rocks are in front of the schools and we have been told, several times, they are there so they can be painted. Each time we have thought, "Oh, O.K."