Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.
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二二八事件被視為台灣歷史上的集體創傷，於1995年被定為「國定紀念日」，卻曾有長達40年無法公開談論。