The prison in which Alef is suspended is impregnable and inescapable in all known conventional and unconventional spatial directions and, any time another path is discovered and tested, another, narrower set of walls is erected to block those off. There was a time before the walls existed, but the prison is now capped at that end, too - no time travel, no closed timelike curves, no possibility of escape via the singularity at the origin of the universe. There will also be a time after which the walls cease to exist. Eventually, there will be an instant of total entropy, the Omega Point which
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