If it is finished externally it's diabolical. Several of the panels are a lighter shade of grey as if they have
been replaced. How much extra would it have cost to make it more interesting to look at. A few gargoyles
or caricatures of people who have passed through SE1 over the centuries. It just looks like a cheap
box. At least when the trees are in full bloom it will hide most of it. Two more weeks should do it.
This came up in conversation last night at the book club, and I had a hard time persuading someone that it was indeed a barometer - so I found this thread, and at the top of page nine, James links to a news article which describes how the light works.