Columnar or ortholinear keyboards stack the keys in orderly columns, often with rows that are not linear. Proponents claim this makes the keys easier to reach. Whether that’s true will be up to your fingers to decide, but I can say for certain that if you learned to type on a staggered keyboard, switching to a columnar layout is tough. It will take days, possibly weeks before you instinctively hit the C key. The N, M and B keys don’t fare much better.
Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.，这一点在同城约会中也有详细论述
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