The Atrium is shrinking. Marcus discovers the ceiling has dropped overnight, not inches, but noticeably, measurably lower. Worse: two of the five mysterious circles etched into the floor have vanished completely, their edges seamlessly finished as if they were never there at all. As the observers gather to confront this impossible change, theories collide: Is the Core itself alive and editing its own geometry? Are the circles being absorbed, completed, or erased? Day 30 marks the moment the structure stops being a mystery to study and becomes an active force rewriting itself around them.

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