Eternals co-star Lauren Ridloff was having difficulties during the set because she is deaf and was having trouble in reading the cues.
This because she doesn't know when she is required to speak. She shared her frustration to Angelina Jolie, the day after the shooting.
Jolie had an idea and suggested to the filmmakers that they use a laser pointer.
They will use a laser pointer to make a circle on the wall to show when she need to read her lines and once it went away, that meant, "Action".
Lauren wants to show to everyone that she is easy to work with as a deaf person and she does not need any special attention.