My preferred route from the Times’s offices in Wapping on to the main road takes me across a precinct then down a short flight of concrete steps to the pavement below. Across the top step (for reasons unclear to me) a yellow line has been painted behind the step’s edge, like those lines you’re supposed to stand behind on railway platforms. Crossing this, and turning right when I reach the pavement, takes me straight to the right-hand side of the steps. A rational pedestrian seeking to shorten his journey would choose such a route, but not with any precision: one could plot a range of courses down the steps, all about the same length, the very shortest taking one right up against the border of the steps.
I chose, however, (perhaps ‘found myself choosing’ would be more accurate) a shallow diagonal somewhat in from the border of the step.
I happened to look down as I approached the top step.
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