Art exhibitions take many forms. They can be surveys of a time, place, artist or artistic movement. They may reconsider an artist through a new prism, or appreciate the familiar in a new or different way. All too rare is the exhibition that invites the viewer to share in the joy of discovery, engaging us as confidants in new revelations that suddenly seem self-evident. “Speaking in Tongues: Wallace Berman and Robert Heinecken, 1961-1976,” is just such an exhibition. At the Armory Center for the Arts in Pasadena, the show was co-curated by Claudia Bohn-Spector and Sam Mellon.