Talking of art and sewage (below), these old bits of plumbing are on the Greenway, which runs along the top of Joseph Bazalgette's 19th Century northern outflow pipe, taking north London's waste down to the Beckton Sewage Treatment Works and thence to the Thames Estuary.
The second one I've featured already, but it's worth a second look. You can check how the graffiti have changed over the past couple of years (not a lot, as it happens). Clean 'em up (though obviously they'd need to keep that wonderful pink) and they'd make much better public art than most of what currently graces London's open spaces. A spot on the fourth plinth at Trafalgar Square, maybe?
Mick Hartley 
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