Lots of gardens have pebbles, but not many have this: a giant ball of pebbles made by UK sculptor and artist David Harber.
Harber, an award winning designer, started making contemporary and traditional sundials in 1992 and have expanded to create water features and garden sculptures like the "Dark Planet" sculptures profiled in this post.
Harber's Dark Planet garden sculptures are made from hundreds if not thousands of black puddle stones perfectly arranged into perfect spheres. Some spheres are wired to illuminate from within, whereas others are turned into water features, with bubbling water emanating from the top of the spheres.
For more on the Dark Planet garden spheres, visit David Harber's official website.