This is for a How-To book that talks about cutting stones to fit your walkway, "All About Patios", Ortho® Books, ISBN: 0-89721-443-9.
This was part of a series of illustrations showing how to install a walkway.
The stone in this detail shot matches the stone in the other long shots, using 3d computer solids many times.
I think if I were to do this again I'd give the guy some gloves.