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圖像加註文字，班德（右）在克林頓任內與卸任後都是他的主要助手——照片中，他在 2001 年克林頓卸任的第一天陪同在側愛潑斯坦文件中的電子郵件顯示，班德尋求麥克斯韋協助撮合人脈，有利於「克林頓全球倡議」。
The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.