Dream of number

I was in London, where there are a number of glass buildings. They were very modern and beautiful. Some were where people lived and some were offices. On the top floor of these modern cube glass buildings, was invented or found something amazing. They filled it with water and somehow with new technology, it brought amazing cooling to the buildings. There was a whole series of these glass cubes with the water in the top floor portion, like a tank. I notice in one of the buildings they actually had fish in the tank! Somehow the fish did not die or overheat in the top! The sun would literally shine on it from above. It was an amazing invention. From the outside you could see in the glass and the tanks looked amazing! water suspended at the top.