Strange, crafty characters lend literal and emotional depth to Sandra Meigs’s works in “The Little Lost Operas,” which brings together the artist’s small compositions referencing eighteenth- and nineteenth-century operas. Loosely painted backdrops draped with fabric curtains set the stage for hand-size puppets (all components include found materials). Some of these assemblages measure just a few inches across; another incorporates a standard side table. Surprisingly, the improvisational pieces emotively outpace their modest means, conveying joy, desire, sorrow, and fear. Together, they charge