Space nonfiller

A space nonfiller is any pattern that expands indefinitely to affect all but finitely many cells in the Life plane, but leaves an expanding region of vacuum at its center. The first nonfiller was discovered by Jason Summers on April 14, 1999:

x = 37, y = 31, rule = B3/S23 19b3o$18bo2bo$12b3o6bo4b3o$12bo2bobo3bo4bo2bo$12bo2bobo3bo4bo2bo$10bo 10bo2bobob3o$10b2o2b2o2bobo4bo5bo$8bo16b2o2b3o$8b3obob2o10bo6bo$6bo8bo 9bobo3b3o$6b3o5bo10bo8bo$3bobo25bob3o$2b5obo26bo$b2o6bo21b5o$2o4b2o18b obo$bobo3bo2bo15bo2bo3bobo$8bobo18b2o4b2o$b5o21bo6b2o$bo26bob5o$b3obo 25bobo$2bo8bo10bo5b3o$3b3o3bobo9bo8bo$3bo6bo10b2obob3o$5b3o2b2o16bo$5b o5bo4bobo2b2o2b2o$6b3obobo2bo10bo$7bo2bo4bo3bobo2bo$7bo2bo4bo3bobo2bo$ 8b3o4bo6b3o$15bo2bo$15b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 THEME 6 HEIGHT 640 WIDTH 640 ZOOM 16 GRID ]]

(click above to open LifeViewer) RLE: here Plaintext: here

By placing a die hard inside the empty space, a pattern can be constructed with the property that every cell in the universe is alive at some point in the pattern's evolution but eventually turns dead permanently.

Also see

• Spacefiller
• Antstretcher

External links

• Space nonfiller at the Life Lexicon