Frank’s essay provoked more emails, and this excerpt caught my attention:
Российская разведка заявила о планах Запада вооружить Киев ядерной бомбой. В Кремле возмущены, Медведев угрожает ядерным ударом24 февраля 2026
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"We welcome today’s decision and look forward to our ongoing collaboration with local officials to bring a fully functioning Google Maps to Korea," Google's senior executive Cris Turner told the NYT in a statement. However, the approval is contingent “on the condition that strict security requirements are met,” a spokesperson from the Transport Ministry said. Those conditions reportedly restrict Google from displaying sensitive military sites and longitude and latitude coordinates.
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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.