Boston Pilot had a bird’s eye view of construction of artist Mathias Gmachl’s “Echoes – A Voice from Uncharted Waters,” which is an 11,000-pound, 56-foot long statue that asks us to ponder our affect on nature and the environment, at the Downtown Crossing Steps at Washington and Franklin streets. Echoes is the first of a series of sculptures to be installed by mid-January as part of a Downtown Boston Business Improvement District public-art show that will then run through March.