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Order or disorder?
(Look from any figure corner.
Created from OpTiles.)

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Dislocation in ornament (upper left);
Dislocation in crystal (upper right);
Equilibrium demagnetized magnetic domain structures (middle);
Bubble domains in non-uniform materials (down).

(N. Asakura: Fundamental Problems of Creating in the Two-Dimensional Space;
M.P. Shaskol'skaya: Kristallografiya, Vysshaya shkola, Moskva, 1984;
M. Pardavi-Horvath: Symmetry in Magnetizm, Symmetry: Culture and Science, 6, 1, 1995, 29-32)

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