2 NYC buildings are having a raging Post-It war in their windows

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Superheroes, Pac-Man and Others Entangled in Heated 'Post-It' War in NYC

NEW YORK (WPIX) -- When Katy McCarthy and Derrick Edwin noticed a subtle message posted on a window at the building across from where they work along Canal Street, they decided to engage.

"We noticed a guy across the street that posted the word 'hi' in simple, yellow, old-fashioned post-it notes," McCarthy explained. "I have a 14-year-old and I thought what do kids say? What kind of lingo do they use? So [we] wrote 'sup.'"

Little did the creative directors from advertising firm Havas know, they started a war.

In a matter of days, superheroes, video game icons and even a prom-posal took up residence on the windows of both buildings, both which house advertising companies.

See some of the incredible artwork:

17 PHOTOS
Post it wars NYC
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2 NYC buildings are having a raging Post-It war in their windows
Other building is going strong!!! Great job!!!! #canalnotes #postit #postitwars #adlife #hs #nyc #havasww https://t.co/E1LxDUmtk7
Employees from some #NYC ad agencies are using @Postit notes in creative battle, sparking the great #postitwars https://t.co/9tosmfg72s
Someone's peeking.. #postitwar #canalnotes https://t.co/rdoiL3hhVK
.@GettyImages mantra in @postit notes! 📷: @juanramos_gyi #canalnotes #postitwars https://t.co/eKy0SRHSAn https://t.co/R4WWYcinxw
Less war, more wine 🍷👏🏼 #canalnotes #postitwars @groupesopexa https://t.co/Y16MzuLDVP
Ad agencies on Canal St, NYC are in a @Postit war. #canalnotes #postitwars #advertising #socialmedia #marketing https://t.co/90adkUHSyi
Windows $100 suggested charity donation #milliondollarhomepage style.SnapChat 1st WIP. Retweet to help #canalnotes https://t.co/DPR41IQQcm
Hangman jumps into the post-it wars #canalnotes #havas https://t.co/6gaRMThS2Y
The Lorax joins the #postit party. #postitwars #postitwar #canalnotes https://t.co/UsBxk4FOOc
In a #postitwar with the office across the street. Didn't start it, but we're gonna finish it! #canalnotes #postits https://t.co/5eD5dJCCmn
Post-it wars NYC #canalnotes https://t.co/fITEkY64cc
Awesome! Two companies engaged in #PostItWars across a New York street. https://t.co/EmB9pymyqQ https://t.co/d81AS1b0Zd
.@edible, we present to you the finished product. #CanalNotes #postitwars https://t.co/6ElTsXK8X0
Post-It wars have taken over the windows on Canal Street https://t.co/AbXv1SkbDi #PostItWars @motylenski https://t.co/rOHQ6GEjWn
Behind the scenes look at the hottest agency battle right now #postitwars @HorizonMediaInc https://t.co/qoJc3O5BaR
I feel like a Post-it spy with a new mission! Thanks, @Postit! #canalnotes #postitwars https://t.co/Wy99ymOGFQ
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Their masterpieces made completely of Post-its notes, each one seemingly trying to out-do the other.

"I think it brings everybody together but I think the reason it does its because its so organic," CEO of Havas Media Colin Kinsella told PIX11 News. "You know you can't really – you couldn't invent this it just happened on its own."

"Its reinforced how good we are with deadlines," Kristina Bostley, editorial director at Biolumina, the pharmaceutical ad agency across the street currently at "war" with Havas.

"We brainstorm and put it all together in a matter of a few hours."

The apparent "war" between Canal's tenants launched a hashtag and even got the attention of Post-it. The company sent reinforcements when the agencies ran low on ammo.

As the so-called Post-It war enters its second week, nearby buildings are jumping on the bandwagon. Unfortunately, it will all soon come to an end.

The property manager which coincidentally operates both buildings on Canal Street are giving workers until May 31 to take down all the Post-its as it violates building code.

Before that happens, the rivaling ad agencies promised to bring "it."

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