Rolling Ball Argument
In topology, quantum mechanics and geometrodynamics, rolling-ball arguments are used to describe how the perceived geometry and connectivity of a surface can be scale-dependent.
If a researcher probes the shape of an intricately curved surface by rolling a ball across it, then features that are continually curved but whose curvature radius is smaller than the ball radius may appear in the ball's description of the geometry as abrupt points, barriers and singularities.
Read more about Rolling Ball Argument: Scale-dependent Topology, Topology Change Without Topology Change, Quantum Foam, See Also
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