One of the most reliable communication materials for centuries, paper historically has served as a vessel, a container for notes or the foundation of an artwork. An upcoming group exhibition at Heron Arts, though, focuses on the humble medium itself and highlights 14 contemporary artists expanding its creative potential. Paper Show features an array of styles, structures, and techniques from the whimsical mobiles of Yuko Nishikawa and Roberto Benavidez’s piñatas to Julia Ibbini’s laser-cut motifs and typographic messages from Judith + Rolfe. Opening July 9, the exhibition will be up through August at the San Francisco gallery. You also might enjoy this book that looks at the artists defining the medium.