This photo is of a sculpture called Column by William Turnbull, created in 1970. It's basically a tall steel rectangle, and this photo is looking down the column onto the base.
I have a photo planned for tomorrow and the day after that, which will be the last day of Year 5! Then on Friday it's onto Year 6, I suppose... can't stop now! Will I ever? Hard to say...
Very interesting perspective and reduction of the structure to a study of modulated tones of blue grey. Out of curiosity I looked up more about the artist (died recently, Nov. 2012), his work, and this particular work. I'm happy to have gotten an introduction to another interesting modern sculptor.