Unix pipes are perhaps the purest expression of this idea:
Real image compression (JPEG, PNG) uses different techniques (DCT, entropy coding), but quadtrees capture the same principle: spend your bits where the detail is, not uniformly across the whole image.
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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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