Loop

Loop
x = 5, y = 4, rule = B3/S23 b2o$o2bo$bobo$2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]]
View static image
Pattern type	Strict still life
Number of cells	10
Bounding box	5 × 4
Frequency class	18.4
Static symmetry	Unspecified
Discovered by	Unknown
Year of discovery	1972
Rules Outer-totalistic rules B/S23 – B3678/S012345678 # of rules 211 = 2048 Isotropic rules B/S2-in3nr – B2ikn34-aijr5-kr678/S012345678
Glider synthesis Fewest gliders 4 Catagolue-generated RLE synthesis Uploaded synthesis RLE loop_synth.rle
Pattern files Plaintext loop.cells RLE loop.rle
Identifiers apgcode xs10_69ar Niemiec ID 10.4 Pentadecathlon ID 10.4

This article is about the 10-cell still life. For an oscillator where a series of reflectors reflect spaceships cyclically, see Glider loop.

Loop (or curl or long hat) is a 10-cell still life.

It can be interpreted as a hook with an attached hooked tail.

It is the most naturally common still life that can act as a hook with tail catalyst; the period-14 oscillator shown on that page has occurred semi-naturally with a loop but not with a hook with tail.

Commonness

Loop is the fortieth most common still life in Achim Flammenkamp's census, being less common than scorpion but more common than fourteener. It is also the forty-ninth most common object on Adam P. Goucher's Catagolue.

Glider synthesis

All strict still lifes with a population of 23 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 35 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

Loop family

Note that some would argue that the loops are members of the hat family.

Hat	Eleven loop	Twelve loop	Thirteen loop	Snorkel loop

External links

• Loop at Adam P. Goucher's Catagolue

• Loop at the Life Lexicon

• The 25 ten-bit still-lifes at Mark D. Niemiec's Life Page