This is the end of the Union Canal. The bit at the end of the canal that you can see in this shot is a rotating boat lift - part of the Falkirk Wheel - which takes boats down to the Forth & Clyde Canal. My other posting shows this aqueduct from a different angle.

http://en.wikipedia.org/wiki/Falkirk_Wheel
http://en.wikipedia.org/wiki/File:Falkrikwheelanimationmedium.gif

Like other posters, I'm not sure if this image really qualifies for negative space....