Construction has begun on what is sure to be the public art project of the year, according to the reader who snapped this photo of the base of the Brooklyn Bridge last night. Over the next few weeks, one of the four waterfalls designed by the Danish artist Olafur Eliasson will be built under the Brooklyn side of the Bridge. Funded by $15 million in private donations to New York’s Public Art Fund, the New York City Waterfalls project is expected to generate $55 million in revenues from tourism.