Tonight the area between London Bridge and Tower Bridge is going to look a little different. HMS Belfast will be camouflaged and the old London Bridge post office building on Borough High St will look like a post box.
You won't be tripping out but you will be witnessing the illuminations for Switched On London 2008 lighting up the bridges, the Tower of London, Potters Fields, Southwark Cathedral and more in a fantastically sustainable and minimally-polluting way.
The festival is all about illuminating our capital better. Where climate change campaigns have focused on switching things off to save energy, Switched On London recognises the practical need to light up our city at night but equally identifies the horrible waste that massive, lit up, deserted office space represents. The entire festival's energy consumption will be audited to prove that better lighting and less consumption is actually possible.
Lighting designers and architects have taken over a whole raft of spaces in the Pool of London and installed lighting schemes that are not only sustainable but unexpected, cheeky, atmospheric and astonishing. Shame it's only on for a week.
Switched On London starts at 6pm this evening and runs till 14 February.