shades of grey departure ice tower of glas curved lights like whales framed silver facade skyline frankfurt vanishing point hallway scale skyscraper alert timing red light ufo area 51 frankfurt underground oil colour industry progress prism blue lagoon sos abstract shapes fading red twilight city Rapsblüte1.jpg Tübingen Treffpunkt zur Kirche am Markt.JPG Tübingen Rathaus am Martplatz.JPG Tübingen am Neckar.JPG Braunschweig - Theater natural curves windy isle 54 columns looking through endless bridge silent river guillemins curves starship terminal leading lines symmetry spiral escalators time dead end obstacle