ah yes, i always found that funny to see in ny... at first i did not understand it.. :Dbut i never saw a purple one!
@ CaT: Yes, I always keep an eye out for these things. Most of the times these walls are (ofcourse) decorated with stuff that is not supposed to be there (stickers, graffiti, posters etc). But I'm always hoping I am gonna catch one of these: http://www.flickr.com/photos/bill_one/30212705/
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