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mathcastles reference

Hypercastle self-reference — 城 (castle/city in Japanese and Chinese)

城 (jō / chéng) means "castle" or "walled city" in both Japanese and Chinese. Sharing the same structural template as the adjacent Biome 71 (terminal + hearts + text + hearts + terminal), this is likely a self-referential nod to the Hypercastle — the 3D aggregate structure that emerges when all of Terraforms is rendered as a single object in cyberspace.