Anish Kapoor at the Tate Britain.

The dark rectangle was in fact coloured midnight blue and went back into the sandstone about 50 cm but due to the pigment used it was impossible to see in...rather like trying to focus on the farthest part of the sky at twilight.

[Dreich]

Great shot.The womans dress is like one of his pigments. Wish I was nearer london to see it

[Carol Wiseman]

Love the way this shot makes you think.