A different angle to this concrete block with a treatment that I keep coming back to.
The only trouble is, it prohibits it's addition to some of my favourite groups - not to mention probably putting off the purists (although Flickr seemed to like it - came in at no. 5 on Explore).
But like so many others have said, photography is an art-form, there are no rules, just the endeavour to produce an engaging image. All long exposure work of course begins with that happy suspension of reality.
Better on black
Canon 5D Mk II
B+W ND110 - Lee .6ND grad
Photoshop CS5 - SilverEfex pro - Lightroom 3