concrete blocks in the waterloopbos vollenhove flevoland netherlands, used to test the way water reacts to certain

architecture autumn beautiful blue concrete construction creek cut dams delta dutch environment fall flevoland flume forest forests heritage historic holland landscape large light marknesse mirror natural nature netherlands noordoostpolder outdoors park perspective protection reflection scenic season see shadow sky stream technology through tourist tree trees vollenhove voorsterbos walls water waterloopbos woods works