|View static image|
|Number of cells||13200|
|Discovered by||Dave Greene|
|Year of discovery||2018|
A line crosser is a pattern which is able to send a signal across an infinite diagonal line of live cells without destroying the line. David Bell built one such pattern in August 2006. It uses many synchronized one-shot period 44160 glider guns on both sides of the line.
An input glider can arrive at any multiple of 44160 generations to first cut the line, then send a glider through the gap, and finally mend the line while leaving an output glider on the other side.
In 2018, using variants of the reactions shown in line-cutting reaction and line-mending reaction, Dave Greene built a smaller stable line crosser that can accept gliders with any timing, as long as they are separated by 501 or more ticks. The pattern shown in the infobox also contains two additional eaters near the diagonal line, which allow the pattern to serve as a line detection mechanism of a sort: a glider will only be sent northeast if a line is actually present in the key location.