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Tom O’Reilly walked home from the Financial District to Charlestown every day, and he would always pass something that disappointed him: the Charlestown Bells. The interactive public art project, installed in 2000 on the dam at the mouth of the Charles River, had fallen into disrepair, and only a few of the Bells worked. So he and a few others from Charlestown launched a grass-roots effort to save the bells and get them back in the hands of the original artist, Paul Matisse, the grandson of Henri Matisse. On Sunday, Matisse and a crew of volunteers will finally reinstall the repaired bells on the dam.