The dashing is not just Tessa’s M.O. but the production’s. With its expressionistic sound (lots of pumped-up heartbeats by Ben and Max Ringham) and sudden slashes of harsh light (by Natasha Chivers), Martin’s busy staging is at pains to help Comer fill the vast space alone. She doesn’t need it; she solves the one-actor problem with her own resourcefulness, handily playing all sides of conversations that sometimes involve several people. And when she must be both a third-person reporter of a remembered event and a first-person participant in it, she makes the echo meaningful by using it to specify the content. The laugh she lets out after saying “We laugh” is a very particular and complicated kind.