Mysterious Apparatus Standing in Yambol

Having walked past this mysterious apparatus countless times, I still can't figure out what its purpose is. Could be a seating area, but doesn't look comfortable enough. Could be a children play area that has bits missing, who knows, but is is still standing. I've never seen anyone use it in any way.

A Rock Playground in Yambol

Amongst the other play apparatus in this Yambol playground is a rock feature. However I am not sure whether it was man made or just a natural rock form that was decided to be left as it was. Quite unique for that matter and an ideal place to sit or perch on if yo are a child.  

A Children's Slide In Perfect Working Order In Yambol

There are many children's public playground apparatus in Yambol, most are crooked, broken in some way or obstructed by cars or other objects. This one is in perfect working condition. Maybe the brick under the end of the slide is there for a later date as a form of repair!