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A UN-chartered defense protocol exploiting the one thing the sophons cannot read — human thought. Four individuals were given near-unlimited resources and ordered to plan humanity's defense entirely in their own heads, without ever explaining what they were doing or why.
The Wallfacer Project is the most elegant counter-move humanity ever made — and the most psychologically corrosive. Tyler self-destructs; Rey Diaz is stoned to death; Hines goes into hibernation with his conscience cracked; Luo Ji becomes the man with his hand on the trigger. The corresponding ETO Wallbreaker project tries to read each man's plan from his behavior, which works for three of them. The fourth, Luo Ji, is officially declared his own Wallbreaker.
A legal instrument — the Wallfacer Act, passed by the Planetary Defense Council in Year 3 of the Crisis Era. The visible expressions of the project: four men placed before the General Assembly cameras, each granted Wallfacer status, each allowed to commandeer global resources without justification. No headquarters. No public org chart.