This piece took me forever! 6 weeks of messing with my head, leading me one way and then another but here at last it's finished.
So those crazy bumpy things are not rocks but recycled Ceramic cones for deburring. (An extremely hard abrasive-free media used for burnishing, polishing, light deburring and driving loose abrasives. It is a proven media choice for use in chemically accelerated processes where a lower density media is required)