http://tingtinglongtingtingfala.blogspot.co.uk/2012/09/london-circle-walk-redux.html"What would happen, we asked ourselves, if we were to apply a pair of compasses to a map of London? How much zigzagging would you be forced to do in order to walk as closely as possible to an imaginary circle on the ground? What would we find along the way?Thus, the London Circle Walk was born."
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