Ernest M English installed a giant paint-by-number canvas on a graffiti wall on Boston's Newbury Street. Almost as soon as he put it up, passerby began asking him what it was and whether they could get involved. Over the course of eight hours, a continuous stream of Bostonians and tourists stopped whatever they were doing to help paint the canvas. Some stayed for a few minutes, others stayed for hours on end. Some came and went several times over the course of the day.
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