Pictures: The sticky note window art battle between two buildings in New YorkPublished1 June 2016Image source, ReutersImage caption, A creative battle has broken out between two buildings in New York competing to make the best window art displays using only colourful sticky notes.Image source, ReutersImage caption, It started when a mystery "HI" appeared on the window of a building and the company opposite responded to it with notes saying "SUP".Image source, ReutersImage caption, Since then, creative window art featuring the likes of Angry Birds characters have appeared.Image source, ReutersImage caption, Even some Adele-inspired song lyrics made their way on to the windows.Image source, ReutersImage caption, This window has taken on an under the sea theme with fish, octopus and seaweed.Image source, ReutersImage caption, We reckon this hamburger might make some workers hungry!Image source, ReutersImage caption, A woman puts the finishing touches on this rainbow window display.Image source, ReutersImage caption, Some of the windows have take on a superhero theme, including this Superman logo...Image source, ReutersImage caption, ...and Spiderman!Image source, ReutersImage caption, The art battle has even inspired offices in different cities such as Toronto, London and Dublin.More on this storyThe man who makes art from rubbish. Video, 00:01:26The man who makes art from rubbishPublished21 September 20151:26Canadian artist draws pictures with bikePublished21 February 2016Frozen bubbles are a work of art. Video, 00:01:00Frozen bubbles are a work of artPublished12 January 20161:00