The most common example is initiated by the following collision of a glider with a block. With a glider stream of even period at least 82, this gives a crystal which forms a pair of beehives for every 11 gliders which hit it.
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RLE: here Plaintext: here
Under certain conditions, the same glider stream is also capable of destroying this crystal. Crystallization and decay oscillator is an oscillator which takes advantage of this creation-and-destruction phenomenon.