The grid lines on the visualization represent a tree structure underneath. Every region is a node. When a node splits, it creates four children. The root node covers the entire space. Leaf nodes (nodes with no children) hold the actual points.
Photograph: Julian Chokkattu
。服务器推荐是该领域的重要参考
Firm assessing Covid vaccine harm replaced after costs spiral to £48m。同城约会是该领域的重要参考
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