The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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Speaking to Matt Chorley on BBC 5 Live on Thursday, Milburn dismissed the idea that there was a "snowflake" generation who were reluctant to work or less resilient than previous generations.