Zach Coffin of "Colossus" reknown http://www.zacharycoffin.com/colossus is unveiling a new sculpture called Rockspinner 6 at Cornerstone Sonoma in Sonoma, CA on May 28 at 3pm. This is a multi-ton granite boulder that's mounted on a stainless base and is so precision-tuned that it can be spun around ...