This visualization demonstrates a three-tier hierarchical structure on a sphere:
Level 1 (Red): Major nodes - like highways/motorways
Level 2 (Orange): Secondary nodes - like A-roads
Level 3 (Blue): Local nodes - like minor roads
Each coarser level snaps to the nearest points in the finer level, creating a natural hierarchy for navigation.
The edge thickness represents the hierarchy level - thick for major connections, thin for local ones.