The report gives a concise but thorough overview of China’s online censorship system, including the motivations behind it and the mechanisms by which it is implemented. But that was the only thing I knew of that tried to explain the technical workings of the censorship system to a lay audience. LE: One of the most serious is that particularly inside the computer science community, we looked at the individual components [of the censorship system]. A related phenomenon that you write about is the growing difficulty of probing the censorship system from the outside, in terms of "bidirectionality." That would be really, really useful to have a better view of.