I had to divert from Barcelona for this one. I'v dropped in the Tate Modern yesterday and saw the new installation by Miroslaw Balka. I am not sure "to see" is appicable word as it is just totally dark box. It is slightly unnerving inside as you can see nothing and people are bumping into each other litterally. Fortunately they are flashing by cameras;-)
Photowise i am not sure you can make a lot of sense out of it as you need to photograph sheer darkness;-) I would be interested to see what the others have got. Here what the Guardian shows.