Arienrhod gaped at the face that the mask revealed.
The fire was also used "as a mask to hide or reveal the body", according to effects supervisor Matt Johnson.
The patients' masks revealed their own emotional states and histories, he said, noting the importance of art in treatment.
Both let their masks slip, and reveal the gentleness that lies beneath.
Originally, a black mask, which allowed the actor to lift it and reveal himself sometimes.
The features the masks revealed were not human.
The online mask does not reveal the actual identity of a person.
Different roles require different masks to reveal the characters, through their changing facial features and decorations.
A mask around his neck revealed he was from Engine 54.
He closed the lid carefully and looked blankly at Teppic, who for the first time was very glad that the mask didn't reveal his expression.