Originally from Gattonside, outside Melrose, education took Murray in his teenage years towards London where he remained throughout most of his adult life.
Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.
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Example: deleting a passkey in Apple Passwords
Tony Jolliffe BBC