http://www.break.com/movies/cool_optical_illusion.html
http://video.google.com/videoplay?docid=-2102104544004622946&sourceid=docidfeed&hl=en
http://video.google.com/videoplay?docid=-5035014176026091700
http://www.excite.co.jp/News/bit/00091107056524.html
http://itpro.nikkeibp.co.jp/article/NEWS/20060823/246263/
http://news.livedoor.com/webapp/journal/cid__2361562/detail?rd
http://video.google.com/videoplay?docid=7898649675399055984
http://itpro.nikkeibp.co.jp/article/NEWS/20060822/246137/
http://www.ykkfastening.com/japan/faq/a007/info002.html
http://www.excite.co.jp/News/bit/odd/00051081820258.html