Helpful graffiti on a whitewashed wall at the Great South Wall, Poolbeg, Dublin, Ireland. Waves can flood the wall at spring tides, especially in stormy weather, trapping walkers until the tide recedes and the wind abates. March 2013. Photograph: Frank Miller (Frank Miller archive image, copyright, fees apply for repro)

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Helpful graffiti on a whitewashed wall at the Great South Wall, Poolbeg, Dublin, Ireland. Waves can flood the wall at spring ...