Traffic lights extruder
The traffic lights extruder is a growing pattern constructed by Jason Summers in October 2006, which slowly creates an outward-growing chain of traffic lights. The growth occurs in waves which travel through the chain from one end to the other. It can be thought of as a complex fencepost for a wick that does not need a wickstretcher.
The following illustrates the reaction used, in which a newly created traffic light at the left eventually pushes the rightmost one slightly to the right.
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RLE: here Plaintext: here