Now office buildings in the middle of Tokyo are dramatically changing. About 8 percents of all the office buildings in Tokyo surprisingly cultivate rice like this photo, with no sunrays and only artificial light of something of fluorescent lamp.
Since the oil is and will be staying in a state of high price, the government gives financial aids to companies making rice and developing bio-ethanol, using the rice, as an alternative energy.
Oh, just kidding, though it is not April 1:-))
Actually a recruitment agency in Otemachi, one of the biggest office districts, makes rice on the second basement floor to let people feel familiar to the agricultural industry, perhaps as well as to promote its corporate identity.