this short clip was taken at Bowness Island, which is the future site of a Field Studies Centre; the structures on the island are still under construction.
you are looking East, and the moving shadows indicate that it's late in the afternoon.
the shadows are cast by the Space Elevator, which is a fully working simulation of a Space Elevator in geostationary orbit.
note how the tram-car also casts its own shadow on the water, and itself moves in and out of the Elevator's shadow :-)
