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Pictures: The sticky note window art battle between two buildings in New York

An art battle created entirely from hundreds of coloured sticky notes has broken out between two buildings opposite each other in New York.
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.
Building with art in windowsReuters
It started when a mystery "HI" appeared on the window of a building and the company opposite responded to it with notes saying "SUP".
Heart made from sticky notes on windowReuters
Since then, creative window art featuring the likes of Angry Birds characters have appeared.
Angry Birds made from sticky notes on windowReuters
Even some Adele-inspired song lyrics made their way on to the windows.
Adele lyrics on windowReuters
This window has taken on an under the sea theme with fish, octopus and seaweed.
Fish made from sticky notes on windowReuters
We reckon this hamburger might make some workers hungry!
Hamburger made from sticky notes on windowReuters
A woman puts the finishing touches on this rainbow window display.
Rainbow made from sticky notes on windowReuters
Some of the windows have take on a superhero theme, including this Superman logo...
Superman logo on windowReuters
...and Spiderman!
Spiderman face on windowReuters
The art battle has even inspired offices in different cities such as Toronto, London and Dublin.
Sun picture on windowReuters