Some materials have a way of not only resisting efforts to manipulate them but also almost battling back.
That seemed the case when, not long ago, S.F. artist Jonathan Runcio was attempting to work with one of the ungainly, rough chunks of concrete that he screenprints with collages of buildings. While he was printing one raw slab on a dolly, it shifted and his leg was pinned. Fortunately, before a scenario akin to an art-world "127 Hours" ensued, a friend freed him.