The cast of An Ark in rehearsal: from left, Rosie Sheehy, Arinzé Kene, Ian McKellen, and Golda Rosheuvel. Photo: Tin Drum Ian McKellen will not be present at this performance. That’s the gist of the email reminder you receive from the Shed before heading there to see An Ark , the “mixed reality” play written by Simon Stephens, directed by Sarah Frankcom, and brainstormed into being by producer Todd Eckert. Though the show is a slight 47 minutes long, it comes heavily padded with special