I wonder what happened here

One of the photos taken on one of the many hikes we took on our autumn vacation into the Black Forest.

[Sidenote: Yes, I know it's a tad blurry. But I didn't want to leave it out. We found those stones, deep in the forest, exactly as you can see them above and were sure, that was a story worth telling. Sadly, the sun was already dropping pretty fast, so light was sparse, thuse the blur.]