This is a clever ad for HSBC by Ogilvy & Mather Mumbai ad agency in India. The bank wanted to raise awareness of the dangers of global warming, so the ad guys glued an aerial photo of a city's skyscrapers to the base of a swimming pool. I think the effect is fantastic. I'm for sure would love to dive in it. Besides in my opinion the Bank gets even more credibility in social and environmental involvement by such a simple and local creativity.