Emu

An emu is a Herschel loop which does not emit gliders. Emus have been constructed for period 52 and for periods 54 and higher (the first few are oscillator-assisted). Quetzals have also been constructed for each of these periods.

Etymology

The name derives from the fact that they are flightless (incapable of emitting gliders). This term was coined by David Buckingham.

Emus as reflectors

Emus can be used to reflect gliders in a variety of ways. Adam P. Goucher (with help from Jason Summers) exploited this property to construct the first period-59 gun. Unfortunately, that method does not generalise to the remaining emu-only periods, since it uses a special p59+15n reaction based on David Buckingham's p44 oscillator.

Gallery

x = 33, y = 31, rule = B3/S23 22bo$13b2o5b3o$14bo4bo$14bob2o2bo$15bo5bo$16bo3b2o$17bo2$10bo$2o3bo4b 2o$2o2b2o5b2o$5b2o4bo$6bo3bo6$22bo3bo$21bo4b2o$20b2o5b2o2b2o$21b2o4bo 3b2o$22bo2$15bo$11b2o3bo$11bo5bo$12bo2b2obo$13bo4bo$10b3o5b2o$10bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 AUTOSTART ZOOM 7 WIDTH 600 HEIGHT 600 ]] Simkin's p60 is a small emu at the size of only 33×31 (click above to open LifeViewer) RLE: here Plaintext: here

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[[ AUTOSTART THUMBSIZE 2 WIDTH 840 HEIGHT 840 ZOOM 2 GPS 26 LOOP 52 ]] p13-assisted period-52 glider gun, a 394×394 p52 emu (click above to open LifeViewer) RLE: here Plaintext: here

External links

• Emu at the Life Lexicon