Photo: All's rocky-steady

Melissa Matsuki Lillie paints a mural titled ‘That's Gneiss!' on Holden Street in North Adams on Monday. The mural -- inspired by microscopic and macroscopic geological formations found in metamorphic rocks that make up the buildings of North Adams -- is the third and last mural of DownStreet Art 2012. The completion of the mural will be celebrated Thursday, Sept. 27, at 6 p.m.