This Makes You Think: It Sure Makes Me Think

 "British banking giant HSBC did a clever thing with a swimming pool: they took a picture of New York City from above and applied it to the bottom to make a point about climate change and rising sea levels. The effect is nothing short of amazing. My eyeballs are still having trouble not believing these people aren’t swimming a thousand feet above the NY skyline."
Photo and text description courtesy of: http://lolawashername.blogspot.com/2010/11/what-if.html