My architecture cousin spent time in Japan last year and she kept an amazing photo log of her travels. One installation that I was particularly impressed by was the Swimming Pool in the 21st Century Museum of Art in Kanazawa by Leandro Erlich.
http://www.leandroerlich.com.ar/
I was also excited to discover that he will be exhibiting at the Museum of Latin American Art (MOLAA) this February 2010!