The Great North Walk is great because it starts in Sydney and not because it links you to Newcastle 200km away. Sorry Novacastrians, cheap shot. We knocked off 10km of it today – from Thornleigh to Lane Cove. Here are all the usual sights and sounds of walking through the Sydney bush, though on this leg the M2 motorway is not too far away so we caught the sound of the occasional Harley running away from the speed cameras. Always alert to something different (apart from adders or red bellied blacks) we were struck today by the high quality graffiti under the Bridge. This is not exactly in the middle of suburbia but I guess someone just could not resist those grey concrete slab canvasses crying out for some work.