Being contractors for many years, he installed it himself.., (we turned to supply only about 8 years ago having had over 20 years as block paving contractors which later developed into landscaping and patio work)
We supply pretty much everything in the job, the natural walling slate, granite setts, paving, kerbs etc etc and the marble sphere...
The black granite setts do look well as a border i agree and it is worth mentioning that the paving was sealed which has kept it looking nice for 4 years now. i will get the limestone photies sorted this week..