REUTERS/Mike Segar
A group of offices in lower Manhattan have started a very colorful war.
Since early May, workers have been creating massive designs - from the Snapchat ghost to Superman logo - by sticking Post-its to their Tribeca office windows.
According to The New York Post, the managers of one building have asked workers to remove their creations by May 28. But until then, they will compete to see who can make the most spectacular Post-it collages.
Keep scrolling to check them out.