A giant Post-it note art war has began in Lower Manhattan, NYC, as a number of advertising agencies and businesses have began to communicate with each other from their tower block offices with giant artwork- made up of colourful Post-it notes.

With companies such as Getty Images, Havas Worldwide, Harrison and Star, Cake Group and Biolumina taking part, each business has made some impressive window displays. From spiderman to giant burgers, each office has created their own 'design' which can be seen from the buildings opposite or the streets below. Messages such as 'Will you marry me?' have also been sighted. IBTimesUK takes a look some at the most original post-it note designs made by employees in New York City: