苏联曾开发出名为“周界”（Perimeter）的自动核报复系统，西方分析人士称其为“死手”（Dead Hand）。此系统的设计目的在于保证即使遭受斩首式打击，威慑依然存在，确保敌人无法轻易摧毁报复能力。
The curtain of reality had pulled back for me, and I could no longer pretend to be ignorant of these eldritch possibilities. I furiously began to map the known breakfasts. If the dark breakfast exists, I must be able to find it in the interstices of the normal familiar world.
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