There was a time when I posted a photo every day, a photo taken in or around Brighton. This was because I became , well, hooked I suppose is the word, on the City Daily Photo idea. I gave it up in the end because I was starting to take - and post - similar pictures far too frequently. Here is one I posted four years ago. It shows a concrete block known as a triangulation point. These were placed around the country by the Ordnance Survey and used to make their maps. No doubt they are completely obsolete now. I pass this particular one quite often as it is sited on the ramparts of the Roman Camp, one of my favourite walks with the dog.