A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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胡集书会已有800多年历史，被誉为中国曲艺界的“活化石”，2006年列入首批国家级非物质文化遗产名录。2026年胡集书会共有来自22个省份的300余名艺人参演，带来四川清音、谐剧、评书评话等65个曲种、412个节目。，详情可参考旺商聊官方下载
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