INCEPTION begins production in Japan!

Chris Nolan's science fiction 2010 summer blockbuster Inception has begun production in Japan, one of six countries the $150-200 million Warner Bros. movie will film. NolanFans snapped a publicity of shot of Leonardo DiCaprio (the hero) and Ken Watanabe (the villain) of the film, along with the director himself... But I'm still left wondering, just what does a "contemporary sci-fi actioner set within the architecture of the mind", actually mean?