Schoolyard Fence Post Spacing as Generational Boundary Markers in Sapporo’s Municipal Kindergartens

札幌市立幼儿园校园围栏立柱间距：代际边界标记

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Across Sapporo’s municipal kindergartens, fence post spacing varies systematically—not by building code but by cohort-specific pedagogical mandates enacted since 1972.
Wider intervals (125 cm) mark post-2005 ‘autonomy zones’, designed to encourage unsupervised peer negotiation during transition periods.

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