Shot at Shinjuku Central Park in Shinjuku, Tokyo. The park is surrounded by some of Tokyo's tallest buildings including the Tokyo Metropolitan Government Buildings. And there was a waterfall in the square in the park.
This might be a remnant of the drinking water treatment plant. Once, this vast area was Yodobashi Purification Plant before it was redeveloped during the 1960s. The water kept running down. Yet most people in the park were relaxing without taking account of it.