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I probably first heard about the walled city 10 years ago, decades after it had been torn down. Obviously, living in that level of density is pretty awful, but I can't deny that the concept holds a certain appeal to me.
Just the idea of packing human beings that closely. Of having a city that basically contains everything (doctors, dentist, butchers, brothels, markets, shops, craftsman, unskilled labor... everything). In such a densely connected region. It is just interesting to think about. You have no real possibility of privacy. You don't even have a choice of being social or not, you are required by proximity to involve yourself with other human beings.
It is one of those "unconscionable experiments" that you would never purposely perform, and yet it is still fascinating.
Anyway, this movie barely touches on that. It is a HK action flick that is pretty great. A lot of big manly emotions. Some cool fights (though I wouldn't say that is the focus). Totally enjoyable simple fun.