I m looking at a photograph on Instagram. It s a striking image of actress Caoimhe O Malley. There she is: eyes closed, long dark hair swept back off her face, prominent dark eyebrows, one large sparkly earring decorating her left ear, her right arm raised above her head. And she s wet. Very wet. So wet that you can see the water running in rivulets down her face, with some individual droplets distinctive on her brow and with others gathered along her top lip.