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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"Every box has a surprise," Machin said as she unwrapped perhaps the most bizarre item here, thought to be from the 19th Century: a set of lower gold dentures found at St Mary's Old Church in Stoke Mandeville.