Prepare to be drawn into “Mirage,” a hallucinatory experience where the natural world’s desecration unfolds through spectral sound and symbolist verse. Performers Jack Symonds, Jane Sheldon and Blair Harris present music by Saariaho, Faure, Dusapin, Sheldon and Symonds. Their spectral sounds creating a mesmerizing, dreamlike experience, a shimmering, unsettling illusion.