If you're like me, you've heard of the black iron prison through the PeeDee website. But are you aware of a related concept, that of Empire? Both were expounded by Philip K. Dick. In essence, the Black Iron Prison is the mechanism by which Empire keeps its subjects trapped. The bars aren't something inherent to humanity, or even to human society. Empire put them there, and its control over our lives (even over those who nominally control nations) is reinforced by the bars.
Empire could be described as the over-arching, or under-arching, stratum of consensus reality which has us doing things like going to jobs, following laws, reading news, or seeking out sex. It has us creating monuments, worshipping idols, and speaking the same language. When we work for Empire, we make it stronger… think about those wretched souls who made the first smartphone. They might not have known it, but they were some of the mightiest pawns who ever lived.