I only saw part of it, joining the tour in the afternoon. Momus and Hisae were attired in what looked like Japanese or Korean uniforms (which, Momus stressed, were not trendy-minimalist Muji products) and carrying 1950s-vintage megaphones through which they talked to a small crowd which had assembled around them, describing to them which part of Tokyo they are in. Well, Momus did most of the talking, with Hisae adding a native Japanese perspective; some of the time (particularly towards the end, when things got a bit more absurd), their act seemed like a traditional comic/straight-man music-hall duo.
The actual content was fairly interesting; we were informed that the National Theatre was actually a trendy shopping centre whose top floor was an art gallery/museum, where yesterday's unsold fashions ended up, and that the mayor of Tokyo makes his way up the river by speedboat at 6pm every day. Other than that, Momus expounded on his theories on Japanese culture and its similarities/differences with British and European cultures (European individualism vs. Asian collectivism/"superlegitimacy", the British stiff upper lip and the Japanese bushidÅ (which is apparently making a resurgence), the falsehood of the assumption that modernism is Westernism, and the rising Gini index in Japan and declining originality of Japanese street fashion (apparently it's all Uniqlo and The Gap in Tokyo nowadays)).