This bridge in Paddington is close to where we stayed in London. I wish I had known about it back then. Of course I would have gone to watch it working, well, if we available at twelve noon on a Friday, the day it operates. It is a rather pointless piece of infrastructure. It is best thought of as a work of art.
If you are not fond of watching paint dry, watch the beginning so that you get the idea, pause it and let the rest of it load, and then go to the end at about 2.00 minutes.