I came across this video by chance (it's in mandarin)
http://www.youtube.com/watch?v=svYfXtOC_Eo&NR=1
what is interesting is that at around 6.29 s, a wu-style tai chi master explicitly talks about mingmen expand ... I've never heard mainstream chinese tai chi teachers talk explicitly about mingmen expand ...
Lipyeow
my experience is that it is not commonly addressed. when it is spoken of explicitly it is only to indoor students. some do not speak of it at all except as an important energetic point. the few times it has come up, the words, "this is a big secret" were involved and the subject was quickly changed.


yeah, i'd say it's pretty rare in tai chi. seems to be pretty common in southern styles though...
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