Interactive e-cast Sharpie billboards

Thanks to Australian Cool Hunter for this post... however, I'm not sure that being allowed and even encouraged to graffiti something in a public space really "satiates" the desire to deface public property as their article suggests. But it is still a nice interactive idea with semi-product demo thrown in. Actually, it reminds me of the Adidas Adicolour campaign detailed here and pictured just below which was much better in my opinion.
Many of us have a fascination with graffiti art, and we sometimes look over our shoulders to make sure no one's watching when we scratch our initials in a freshly laid slab of concrete, or carve them into a wooden desk, or even scribble profanities across the stall door in a public toilet.
The creative minds working for Sharpie, the ultimate in permanent markers have discovered a way to satiate our desires to deface public domain. Interactive e-cast billboards have been scattered around cities, which allow people to experience the rush of creating their own graffiti. Choose some colours, write a message and Sharpie makes it possible for anyone to leave his permanent mark on the side of the bus stop or the public phone or anywhere else billboard advertising may be experienced.