Co-ops, schools, associations and art groups often mount shows that feature the work of their members exclusively. Material Engagements, at Laura Merage's RedLine, comprised pieces by the complex's residents and former residents, and it was definitely a winner. Guest curator Harmony Hammond made the savvy decision to choose material as the organizing theme; this was a necessary call, given that there is no particular stylistic requirement for RedLiners and every artist does his or her own kind of work. Among the best aspects of the exhibition was its intelligent design, with each of the two dozen artists given a dedicated space and plenty of breathing room.