Best Fountain in Japan

I want to talk to native English speakers. Recently, there are many tourists who have asked me for directions. One of them asked me  where he could see the best fountain in Osaka. At first, I was confused. I've never heard of it. Searching the web, one picture ringed a bell to me. It's a picture of the fountains in Expo City. It was built in 1970 by the famous architect, Isamu Noguchi, but now, they are not in use. I showed the picture to him and he said that that was exactly what he was looking for. I read the article and it said that the fountains were going to be repaired. I wish he could see these fountains working again someday.