PS I Love U: Should I press the button?

PS (Pubilc Space) I Love U is next Saturday, September 21st. Have you registered your team? It’s free! Explore the city and win prizes! Add us on Twitter @psluv604, #psluv604. Registration ends September 17th so do it now at http://psluv604.tumblr.com/play !

So what does that button do?