She was hellbent on proving to a journalist from an online magazine — a "rag," she called it — that an object from space would pass by and nothing Earth shattering would happen, well, to Earth.
However, that's in Act Two. Sean Grennan's A Rock Sails By at Actors' Playhouse through Sunday, June 9, begins a bit more sedate. Cummings is sitting in an Adirondack chair on her porch. She's sipping a glass of white wine; the bottle is on the table next to her. She listens to a voicemail left by her husband; he's bemoaning the fact that he can't find artichokes at the grocery store.
From the start, Turnbull, last seen in Zoetic Stage's Cabaret, is Dr. Lynn Cummings. Still reeling from the death of her husband, it's just about the only time that Cummings shows emotion. But Turnbull knows how to steady the balancing act so that the two-time Nobel Prize-nominated sardonic scientist doesn't come off as a one-dimensional naysayer. She's a woman of fact, making it clear that Hippocrates said it best: "There are in fact two things, science, and opinion; the former begets knowledge, the latter ignorance."
She also has a photographic memory, which she announced by its medical term: "I have Hyperthymesia. I can remember the weather, the events for every day I've been alive. I can't forget a thing..." We learn that she is starting to experience signs of cognitive decline.
Turnbull knows how to do justice to the brilliance in Grennan's writing. It's at times witty, other times deep. He has a knack for writing comedy and is especially smart with comedic timing. An assistant sees Cummings adding up numbers on a piece of paper. She's awestruck. "Wow, I'm watching you do math with a pencil. This is like Colonial Williamsburg."

Laura Turnbull, as Dr. Lynn Cummings, receives some confusing phone calls in A Rock Sails By.
Photo by Alberto Romeu
The playwright gives his main character the best lines, and Cummings is the most developed character, leaving others a bit thin. We could learn more about 30-year-old daughter Olive (Mallory Newbrough) — yes, she hasn't followed in the footsteps of her mother; she's visiting the house she grew up in, living somewhere else, getting a PhD in English literature. She's come back home because she's noticed a change in her mother while on the phone with her and is concerned about a fender bender where Mom rear-ended another car. But Olive is more or less a sidecar for the main character's story. To be clear, it's a small place for improvement and doesn't upset the balance of the play.
Grennan does have fun with Jason Harper (Daniel Llaca), the next most evolved role in "A Rock Sails By." He's caught in the middle of pleasing his editor, who is only concerned about getting "clicks" for the online magazine, and his need for the job but is torn between that and his ethics. Llaca's spectacularly combustible conversations with Turnbull's Cummings are volleys that are a joy to watch. The two actors play off of each other with a familiar energy.
The fourth player is Lela Elam, who must play multiple roles, and while they are, in many cases, insignificant except for the final surprise role toward the end of the show, the task of wearing these multiple hats is a feat.
She's Jason Harper's editor, she's Cummings' assistant, Haley, at the university where the astrophysicist is head of the department, and, in another scene, the university's chancellor. She's the doctor who arrives in the medical office with a box of tissues to deliver news about Cummings' declining memory, and then, she's the Messenger. It would be a spoiler to talk more about the Messenger, but Elam finds a way to make what could easily become a Lost in Space caricature into a multidimensional being.
Arisco is a self-described "big fan" of Grennan's work. In fact, this is the sixth time (two musicals, Another Night Before Christmas and Married Alive in 2009, and three plays, Making God Laugh in 2013, The Tin Woman in 2016, and Now and Then in 2022) Actors' Playhouse has presented one of the Illinois-native playwright's works; the third time Turnbull has appeared in one.

Daniel Llaca as Jason Harper, and Laura Turnbull as Dr. Lynn Cummings in A Rock Sails By
Photo by Alberto Romeu
In Act Two, the bench is the sole set piece.
The floor is painted black (all of this presents the space in a quasi-black-box type setting) with different celestial shapes. Brandon M. Newton did the scenic design, Jodi Dellaventura the set dressing and properties, Eric Nelson the lighting, and Ellis Tillman the costumes. Reidar Sorensen's sound — ranging from crickets chirping to atonal violin music — creates atmosphere.
Grennan based A Rock Sails By on a true space phenomenon where, in 2017, an interstellar object, dubbed "Oumuamua" (the Polynesian word for "scout" or "messenger" — the telescope that discovered it is based in Hawaii) stumped scientists as it whirred by Earth at high speed. According to NASA, "the mysterious visitor is the first object ever seen in our solar system that is known to have originated elsewhere."
And don't think it merely a coincidence that doughnuts play a role in a few scenes where Jason, the journalist, is hoping to win Cummings' trust through food. Grennan has obviously done more digging. In July of 2021, astrophysicists posited that our universe may be finite, which means that space is closed in on itself in all three dimensions like a 3D doughnut. For decades, astronomers have argued about the nature of the universe's overall geometric shapes.
You'll ponder these and many other profundities, too, after seeing Grennan's play.
– Michelle F. Solomon, ArtburstMiami.com
A Rock Sails By. Through Sunday, June 9, at Actors' Playhouse, 280 Miracle Mile, Coral Gables; 305-444-9293; actorsplayhouse.org. Tickets cost $55 to $75. Performances occur Wednesday through Saturday 8 p.m. and Sunday 3 p.m. (Additional matinee at 2 p.m. Wednesday, May 22.)