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.
The industry hasn't quite embraced modular smartphones just yet, even though there have been some nifty concept designs. Google's Project Ara prototype goes back more than a decade, and the same can be said of other concept designs that never saw the light of day.
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