British conceptual artist Lucy Skaer once left a diamond and a scorpion together on an Amsterdam street. ‘Us to Them V,’ a photo of Skaer comparing natural materials to French Post-Impressionist Eduoard Vuillard’s 1895 painting ‘Album’ in the Metropolitan Museum of Art, isn’t quite so dangerous. But it does make a strange juxtaposition that interrupts usual ways of thinking of 19th century art. (At Simone Subal Gallery the group show ‘It’s Over There,’ Lower East Side through Feb 10th).