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Spatial instrument / Field guide
Armillary Sphere
Multiple circles can explain orientation when each ring has a distinct role.
Reference periodAncient models through early modern astronomy
Typical materialMetal, wood and engraved scales
Visual structureIntersecting rings · shared centre · marked axes
What to notice
Rings represent different great circles or coordinate relationships around one centre. The object is explanatory as well as ornamental.
Editorial reading
Nested interface rings should likewise have distinct jobs. Decorative orbits become noise when no relationship is being shown.
Institutional references
Reading the reference responsibly
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