Gary,
Saw this in the Thames today while walking back from a customer visit and instantly thought of your barrels. I could not resist taking the picture and playing with it in PSE, hope you don't mind.
Tried using your technique to see what would happen - needless to say the Thames looks much the same just more pallatable in B&W!!!!
Taken with a FujiFilm 4700z at full optical magnification and it still looked small.