The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
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I asked a more data-science-oriented followup prompt to test Opus 4.5’s skill at data-sciencing:
Would an AI model trained on such things be not just more authentically premodern, but more authentically aligned with implicit human values?
Update, February 25 2026, 4:35PM ET: This story has been updated to include more details on the Perplexity AI integration, as well as include mentions in the intro of our hands-on and pre-order articles.