The previous evening's storm clouds have cleared to bathe Tokyo in crisp sunshine. Tadashi Yanai, Japan’s richest man and the founder of $73 billion apparel empire Uniqlo, is perusing the art books that line his wood-paneled office, which, like most of his firm’s cavernous headquarters, commands sweeping vistas of the Sumida River. Finally, he retrieves one he believes will be of particular intere