Sliding Stones (Otherwise known as Gliding Rocks,) are basically just rocks that move on their own. Don't ask me how in the heck the do it, cuz I don't know. Anyway, the sliding stones can travel in either strait lines, in curves, in zig zags or even all of the above, although sliding stones with a smooth underside tend to wander around a bit more. Sometimes the rocks flip over, causing their trails to become different, and sometimes they even head back in the direction they came. Whatever the hell their reason, they're certainly an interesting anamolly in my opinion.