The view from the living room of an apartment of the Elithis-Danube tower, partially protected by panels made with photovoltaic elements, is seen in Strasbourg, France, June 14, 2018. According to it's developers this Elithis-Danube, a 16 storey and 50 meters high tower, is the first positive-energy residence tower in the world. Picture taken June 14, 2018. REUTERS/Vincent Kessler