This is architect Felix Claus’s house in Tokyo. Award winning lever handle, Agaho 146 is used.
Mr. Claus made best use of technical capabilities in Japan. For example, he has tried to see how far he can race up the stairs. The shape and size of the stair tread changes slightly at each step. According to him, it is only Japan made it possible to make such things in steel at a reasonable price.
More information on Agaho Lever Handle 146 and other items can be found at: http://www.west-inx.com/product/