Ariel, the sprite who serves Prospero in “The Tempest” is the first non-human character featured on Shakespeare’s Shadows. Dr. Brinda Charry — an English professor at Keene State College — and Mark Quartley — currently playing Ariel for the Royal Shakespeare Company — discuss Ariel’s complicated relationship with his master, varying interpretations of the moment he is set free, and how Ariel discovers what it is to be human. Quartley also talks about his unique experience playing Ariel via real-time motion-capture technology in this stage production running at the Barbican Theatre in London through August 18th. He co-stars opposite Simon Russell Beale, returning to the RSC as Prospero after having taken on the role of Ariel in 1993.