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.
FirstFT: the day's biggest stories
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of polling (scanning) communications lines and implementing the SDLC protocol
She is now facing calls to pause a government plan to scrap the lower minimum wage for 16 and 17 year olds, as some employers are saying it will make it too expensive to hire young people.