Lighting and AV design.
“visually and audibly it attacks the senses. The base lighting for the 60 minutes is unsettlingly dim; creating long, atmospheric shadows. This subdued light is interrupted with fluorescents, jolting the audience into the minds of the patients and victims. Not the only technique used to disturb the viewer’s senses, one particular scene is so visually and descriptively unsettling you can feel the whole audience shifting in their seats, pulsating at the rawness of what is unfolding in front of them.” Frowning, 2015