Iposcenio, or “hyposcenium,” refers to the below-stage space where scenery and props are kept out of sight in the deep bowels of a theater. It was a fitting title for this exhibition of Guglielmo Castelli’s paintings, all tied to introspection or, rather, to the possibility of giving form to what lies hidden in the unconscious. This young Turinese artist’s idiosyncratic work contains no real narrative but offers potential plots and stories on the verge of being, or that might have been but never happened. Viewers are offered rapid glimpses into the interval between a before and an after, the