Here is a first example illustrating in animated fashion the effects of lattices rotating on top of each other - an important concept in grain boundary theory. Link to the newest version of this page without insets

# Animation: Two-Dimensional Coincidence Lattices Obtained by Rotating Two Hexagonal Lattices

| The animation rotates a hexagonal lattice on top of an identical one. For certain angles some lattice points coincide: this is shown for a few seconds.
|  | Due to small aberrations in the drawings, the coincidence is not perfect, but close enough to show the development of a "Coincidence Site Lattice"

A lot more could be in this context by animations. But, all things considered, maybe it would be more useful to implement a JAVA applet for all possible situations than to produce many individual animations?

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