Periodic Boundary
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The orange locator shifts the green block over the blue square whose opposite edges have been identified. The shifted block reenters from the opposite side if shifted across the boundary.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Periodic Boundary"
http://demonstrations.wolfram.com/PeriodicBoundary/
Wolfram Demonstrations Project
Published: March 7 2011