Non-monotonic spaceship 1

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Non-monotonic spaceship 1
x = 21, y = 11, rule = B3/S23 10b2obo$6b3obob3o$2bobo10bo3b2o$2o4b2o5bo3b4o$2bob2o2bo4b3obo$8bo4bo$ 2bob2o2bo4b3obo$2o4b2o5bo3b4o$2bobo10bo3b2o$6b3obob3o$10b2obo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 ZOOM 18 TRACKLOOP 4 -1/4 0 ]]
Pattern type Spaceship
Number of cells 66
Bounding box 21 × 11
Direction Orthogonal
Period 4
Mod 4
Speed c/4 | c/4
Heat 67.5
Discovered by Hartmut Holzwart
Year of discovery 1992

Non-monotonic spaceship 1 is a c/4 orthogonal spaceship that was found by Hartmut Holzwart in August 1992. It was the first orthogonal non-monotonic spaceship to be discovered.

Other c/4 non-monotonic spaceship

In Keith Amling's Period-4 xWSS agar ship, another such spaceship is used for stabilisation, that acts more like a p4 pipsquirter, albeit still receding a single cell (as is the maximum amount a c/4 orthogonal spaceship can recede), but receding to a single-cell front row instead of three adjacent (so its frontend displaces by (-1,0,1,1) across the period instead of (-1,1,0,1)).

x = 18, y = 17, rule = B3/S23 5b3o2b2o$5bobo2bo2b2o$2bob2o7b2obo$b3o3bo9bo$5b4ob2o2bo2bo$b3o2bobobo3bo$bobobobo3b2o4bo$bo11b3obo$o2b2o$bo11b3obo$bobobobo3b2o4bo$b3o2bobobo3bo$5b4ob2o2bo2bo$b3o3bo9bo$2bob2o7b2obo$5bobo2bo2b2o$5b3o2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 2 HEIGHT 378 ZOOM 18 TRACKLOOP 4 -1/4 0 AUTOSTART ]]
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