Glider loop

Glider loop (or simply loop) is a pattern in which two gliders are bounced back and forth between two ever-retreating 7-engine Corderships. This same glider-bouncing reaction can be seen in sawtooth 362.[1]

Glider loop
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 73, y = 150, rule = B3/S23 45bo$37b3o5bo$36bo2b2o3bobo$35bo5bo3bo$41bo3bo$36b2o2bo$25b2o11b2o$25b 2o6$61bo$17b2o40b2ob2o$17b2o42bo3$59b2o$58bo2bo$51bo5bo3b2o$51bo5bo4bo $9b2o40bo6bo3bo$9b2o37bob3obo3bo2bo$48b5obo5bo$48bobo$52b2o17bo$52b2o 9b3o5bo$52bo9bo2b2o3bobo$51b2o8bo5bo3bo$46b2o3bo15bo3bo$17b3o31bo10b2o 2bo$20bo29b2obo10b2o$15b2o4bo30bo$18bo3bo$14bo4bo2bo$14bo3bo3bo$14b3ob ob2o$18bo$14b4o7b3o$14b2o8bo3bo$24bo4bo28bo$26bo3bo25b2o9b2o$23b3obo2b o24b2o8b3obo$22bo7bo23bo10bo3bo$22bobo3bo26b5o5bob2o$21b2obo3bo27bo10b o$21b2ob3o5$63b2o$63b2o4$43b3o$46bo$41b2o4bo$44bo3bo6b2o$40bo4bo2bo6b 2o$40bo3bo3bo$40b3obob2o$44bo$40b4o$40b2o2$47b2o$47b2o2$33bo$33bobo$ 33b2o3$38b2o$37bobo$39bo2$24b2o$24b2o2$31b2o$29b4o$28bo$25b2obob3o$24b o3bo3bo$16b2o6bo2bo4bo$16b2o6bo3bo$25bo4b2o$26bo$27b3o4$8b2o$8b2o5$46b 3ob2o$5bo10bo27bo3bob2o$4b2obo5b5o26bo3bobo$3bo3bo10bo23bo7bo$3bob3o8b 2o24bo2bob3o$4b2o9b2o25bo3bo$14bo28bo4bo$44bo3bo8b2o$45b3o7b4o$54bo$ 51b2obob3o$50bo3bo3bo$50bo2bo4bo$50bo3bo$20bo30bo4b2o$7b2o10bob2o29bo$ 6bo2b2o10bo31b3o$bo3bo15bo3b2o$bo3bo5bo8b2o$obo3b2o2bo9bo$bo5b3o9b2o$b o17b2o$22bobo$12bo5bob5o$11bo2bo3bob3obo37b2o$10bo3bo6bo40b2o$10bo4bo 5bo$10b2o3bo5bo$11bo2bo$12b2o3$11bo42b2o$9b2ob2o40b2o$11bo6$46b2o$33b 2o11b2o$32bo2b2o$27bo3bo$27bo3bo5bo$26bobo3b2o2bo$27bo5b3o$27bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] <nowiki></nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
View static image
Pattern type Miscellaneous
Number of cells 456
Bounding box 73×150
Discovered by Unknown
Year of discovery Unknown
This article is about the aperiodic pattern using Corderships to bounce gliders back and forth. For glider loop oscillators, see Adjustable glider loops.

As gmc_nxtman pointed out in January 2018, a 2-engine Cordership can reflect a glider 180 degrees while preserving its mod-4 timing,[2] giving an updated version of glider loop:

<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 67, y = 128, rule = B3/S23 12bo$12bo5b3o$11bobo3b2o2bo$12bo3bo5bo$12bo3bo$17bo2b2o$18b2o11b2o$31b 2o7$b3o35b2o$b3o21bo13b2o$2bo12b2o9b2o$3b2o9bob3o8b2o$4bo9bo3bo10bo$3b o11b2obo5b5o$16bo10bo3$b2o$b2o$2bo$2bo$bobo$o$bo2b2o$2bo3bo$4b2o$4bo7$ 6b2o$6b2o$19bo$19b3o$20b2o$20bo$21bo$18b3obo$17bobob2o$18bobo31$46bobo $44b2obobo$44bob3o$45bo$46bo$45b2o$45b3o$47bo$59b2o$59b2o7$62bo$61b2o$ 60bo3bo$61b2o2bo$66bo$63bobo$64bo$64bo$64b2o$64b2o3$39bo10bo$38b5o5bob 2o11bo$37bo10bo3bo9bo$38b2o8b3obo9b2o$39b2o9b2o12bo$26b2o13bo21b3o$26b 2o35b3o7$34b2o$34b2o11b2o$45b2o2bo$50bo3bo$44bo5bo3bo$45bo2b2o3bobo$ 46b3o5bo$54bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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Glider loop with 2-engine Corderships (click above to open LifeViewer)
RLE: here Plaintext: here

Videos
<iframe src='//www.youtube.com/embed/sfdiHxhQ0fk?' width='300' height='169' frameborder='0' allowfullscreen='true'></iframe>
Several rounds of the gliders looping back and forth
gollark: Targeted adverts, though?
gollark: Adverts are currently evil and will get increasingly bad as people begin to realize that advertising may not actually be as effective as is hoped and the adtech industry tries to squeeze blood out of a stone by frantically scooping up more and more data.
gollark: More predictions: people will continue to try and get rid of plastic straws and do other such entirely ineffective stuff because environment.
gollark: Ice, yes.
gollark: Seems like we're going for Mars first, sadly.

References
  1. Alan Hensel's lifep.zip pattern collection.
  2. gmc_nxtman (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
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