And here is a sandbox with a contraption in the middle that I don't quite understand. All you can do with it is fill the little digging thing with dirt, you can't swivel around or anything in it, so it seems pointless to me, and a bit awkward seeing kids try to use it.

Reference image:


Render, I added a little bit of color to it real quick just to make it stand out a bit and I did away with the physical sun and sky lighting in the render:


Wireframe: