this is the sagrada familia. gaudi's unfinished masterpiece.ction began in 1882 and is still years away from completion. free-flowing sculptures adorn the structure from one end to the other. people have called it a bible of stone. block by block etsuo sato has spent nearly four decades carving and shaping many of those stones. now 62, he is the project's only official sculptor. sato grew up in japan and studied sculpture. at the age of 25 he left for europe. a chance visit to the sagrada familia convinced him he had found what he was looking for. >> translator: all i saw was the mountain of stone blocks at the site. that was it. i just wanted to carve them. i was willing to devote everything i had at that time. >> reporter: sato went to the construction site almost every day and asked to be allowed to help. finally, the architect hired him as a sculptor. the going wasn't always easy. there were many local artists who were equally passionate about the project. some even offered to volunteer. >> translator: some people must have wondered why for

so i scattered many of them here and there. >> reporter: the chief architect says the sagrada familia completed in 2026, a century after gaudi's death. but sato says no one knows when the decorations including the sculptures will be finished. >> translator: gaudi died before realizing his dream. somebody has to follow that dream as keenly as he did. i think what we need to pass on is passion. if we can convey that to future generations, the people who take over our jobs will produce what gaudi imagined. even if they use different techniques. >> reporter: for now sotoo will keep chipping away as he carries on gaudi's dream. miss acko oshie, nhk world. >>> a unique choir is entertaining passersby in tokyo's youth-on theed eded harajuku district. at the commander's command -- or rather the conductor's command, 300 smartphones and tablets harmonize in synthesized voices. animated characters on the screen mouth the words and dance in time with the music. the mobile devices use their sensors to detect human movements and react accordingly. this enables them to follow a conductor's command t