Shepherd's Bush Roundabout
Intersection between the A3220 to the north, Holland Park Avenue to the east, [Holland Road]? to the south and a road to the west which splits into the Uxbridge Road to the north side and Shepherd's Bush Green to the south side of [Shepherd's Bush Common]?.
It has a rather unusual piece of art in the middle of it which is a blue and clear plastic and steel water tower, sponsored by Thames Water and designed by architect Nik Randall. It was built on top of one of the pumping stations that bring water to the surface from the London Ring Main when the station was constructed in 1994.
Opinions vary on what the changing water levels in the tower mean. Some think that it's a barometer, and the higher the water, the higher the pressure; others think that it's a pressure-balancing tower and the height is chosen to match the water table somewhere like Harrow. If anyone has a definitive answer, it would be appreciated.
http://www.brookes.ac.uk/schools/planning/LTRC/conference2003papers/Stacey-Paper.doc! would seem to be a definitive answer.