Blocker

Blocker
6bobob$5bo4b$2o2bo4bo$2obo2bob2o$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 4 THUMBSIZE 2 ]]
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Pattern type	Oscillator
Number of cells	15
Bounding box	10 × 5
Frequency class	27.2
Period	8 (mod: 4)
Heat	9
Volatility	0.89 | 0.89
Kinetic symmetry	Unspecified
Discovered by	Robert Wainwright
Year of discovery	1970s?
Rules Outer-totalistic rules B3/S23 – B378/S23678 # of rules 25 = 32 Isotropic rules B3-cey/S23anq – B2n34acety5-y6-n78/S234-anry5-ci678
Glider synthesis Fewest gliders 5 Catagolue-generated RLE synthesis Uploaded synthesis RLE blocker_synth.rle
Pattern files Plaintext blocker.cells RLE blocker.rle
Identifiers apgcode xp8_g3jgz1ut Pentadecathlon ID 15P8.1

Blocker is a period 8 oscillator found by Robert Wainwright. It is a useful dot sparker consisting of two blocks hassling an unnamed object which is a dying spark. It reappears half way through its cycle rotated through 180 degrees.

Blockers can also be infinitely connected by "sharing" blocks, as long as adjacent reactions are no more than one phase apart. They can also be connected with Coe's p8, which uses blocks as hasslers in a similar manner.

x = 38, y = 12, rule = B3/S23 16bobo5bobo$15bo7bo$7bob3o2bo4bo2bo4bo$7b5obo2bob2obo2bob2o$7b2o5b2o6b 2o$4bo2bo25bob3o$2o3b2o26b5o$2o3bo18bobo6b2o$15bo7bo6bo2bo$10b3ob2o2b 2o2bo4bo3b2o$10b4o4b2obo2bob2o3bo$14b2o6b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THEME 6 GRID GPS 8 GRIDMAJOR 0 ZOOM 16 HEIGHT 480 THUMBLAUNCH THUMBSIZE 2 LOOP 9 ]]

Blockers sharing blocks (click above to open LifeViewer) RLE: here Plaintext: here

Commonness

Blocker is about the sixteenth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than mazing but more common than jam. On Catagolue, it is the second most common period 8 oscillator, being less common than the figure eight but more common than Coe's p8.

See also

• Coe's p8
• Filter

External links

• Blocker at the Life Lexicon

• Blocker at Adam P. Goucher's Catagolue

• 15P8.1 at Heinrich Koenig's Game of Life Object Catalogs