Concentric
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Concentric objects share the same center, axis, or origin. Circles,spheres, cylinders, tubes, and other round objects can be concentric. Concentric shapes do not normally have the same radius.
Concentric Media
An archery target, featuring evenly spaced concentric circles that surround a "bullseye".
Kepler's cosmological model formed by concentric spheres and regular polyhedra
Ripples in water
Histology of a Pacinian corpuscle, in a typical expanding circular pattern.
Tree rings, as can be used for tree-ring dating
