## 'Skimmers'

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.
lllllllllwith10ls
Posts: 11
Joined: May 11th, 2020, 3:11 pm

### 'Skimmers'

A skimmer (name by MagmaMcFry#3139 on the Conwaylife Lounge) is a 'spaceship' that moves along the edge of an agar, without disrupting it. Have any of these been discovered in any rule?
mom fapathi

MathAndCode
Posts: 118
Joined: August 31st, 2020, 5:58 pm

### Re: 'Skimmers'

lllllllllwith10ls wrote:
September 16th, 2020, 6:59 pm
A skimmer (name by MagmaMcFry#3139 on the Conwaylife Lounge) is a 'spaceship' that moves along the edge of an agar, without disrupting it. Have any of these been discovered in any rule?
Grayships need to be stabilized at their sides. Does that count? If so, then here is a c/2 example, and here is a c/3 example (downloadable here).
Marine has a non-centered Moore neighborhood and at least one gun with a very high period (11,843).
I'm in the process of reducing the glider cost of universal construction.

dvgrn
Moderator
Posts: 7157
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Contact:

### Re: 'Skimmers'

MathAndCode wrote:
September 16th, 2020, 7:05 pm
Grayships need to be stabilized at their sides. Does that count? If so, then here is a c/2 example, and here is a c/3 example (downloadable here).
I guess it depends on what the boundary of the agar is. If the boundary is a P1 stabilization, then there aren't many grayships that produce and destroy an edge like that, are there?

You can mine lots of good "skimmers" out of recent discussion in the Spaceship Discussion thread between Hartmut Holzwart, Keith Amling, Sokwe, and others... but only if there's a grayship that at some stage produces the exact same boundary between agar and empty space that you want to run your "skimmer" on.

lllllllllwith10ls
Posts: 11
Joined: May 11th, 2020, 3:11 pm

### Re: 'Skimmers'

Here are some examples of skimmers here:

Code: Select all

``````x = 66, y = 79, rule = B3/S23
3bo2bo2bo2bo2bo2bo2bo2bo3bo\$b26obo\$o27bo\$b26o\$32b2o2b2ob2ob2o\$b26o2b2o
b2o3b2ob2obo\$o27b2o5bo\$b26o2b14o\$43bo\$b42o\$o\$b42o\$43bo\$b42o\$o\$b42o\$3bo
2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo12\$3b2o2b2o2b2o2b2o2b2o2b2o2b2o
6bobo8bo\$3b2o2b2o2b2o2b2o2b2o2b2o2b2o4bo3bo2b3o5bo\$30b3o9bo5bo\$b30obob
3o2bo2bo\$o29bo5bo2bo5bo2bo\$b26o5bo8b2o\$30bo3b2o5b2o\$b30ob2o3b3o6bo\$o
37bo5bo4bo2b2o2b2o\$b35o3bob5o2b2o2b2o2b2o\$39bo6bo\$b59o\$o59bo\$b59o2\$b
59o\$o59bo\$b59o2\$3b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b3o\$3b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2bo2bo\$
61b2o6\$46b2o\$42bo\$41b2obobobo\$3b2o2b2o2b2o2b2o2b2o2b2o2bobo5b5o7bo\$3b
2o2b2o2b2o2b2o2b2o2b2o2bobobo2bo2bobo2bo\$31bobo5bobo4bo\$b28o2bo5bobob
4o2b2o\$o28b2o5b2obobo3b3obo3b2o2b2o2b2o\$b25o6bo3bo10b4o2b2o2b2o2b2o\$
33bo\$b27o13bo5b18o\$o38b2o4b2o7bo10bo\$b27o3b2o3b2ob2ob2ob2o2b2o4b10o\$
29b2o3b2o12bo4bo\$b27o2b3o2b11o3b16o\$o47bo16bo\$b64o2\$b64o\$o64bo\$b64o2\$
3b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$3b2o
2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o!``````
The greyships don't look like skimmers to me.
mom fapathi

Moosey
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### Re: 'Skimmers'

Skimmer that adds width rather than subtracting, by wildmyron, reduced by blinkerspawn to this:

Code: Select all

``````x = 83, y = 23, rule = B3/S23
64b3o2b2ob2ob2ob2ob2o\$61b7o2b2ob2ob2ob2obo\$60b2o6bo\$58b2o2b20o\$3bo2bo
2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2b2o14b2ob2o22bo\$b40o12b2o5b22o\$o49b2ob
2o6bo\$b39o8b2o5b2o5b20o\$45b2ob2o11bo20bo\$b41ob2o5b2o3b2o3b22o\$o42b2o8b
2o3b2o\$b39o5b2o3b2o2b3o2b23o\$48b2o32bo\$b41o3b2o2b33o\$o42b2o\$b41o2b38o\$
82bo\$b81o\$o\$b81o\$82bo\$b81o\$bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2b
o2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo!``````
I am a prolific creator of many rather pathetic googological functions

My CA rules can be found here

Also, the tree game
Bill Watterson once wrote: "How do soldiers killing each other solve the world's problems?"

Nanho walåt derwo esaato?

wildmyron
Posts: 1447
Joined: August 9th, 2013, 12:45 am

### Re: 'Skimmers'

p4 lightspeed skimmer which travels on boundary of blocks, but offsets the blocks by 2 and consumes 2 rows of zebra stripes:

Code: Select all

``````x = 66, y = 35, rule = B3/S23:T66,100-4
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o2\$50o4bo\$50bo4bo2b2o2b2o\$44ob2ob2o4b2o2b2o2b2o
\$45b2o4bo\$42o5b19o2\$42o3b21o\$43b2o\$42o2b22o2\$66o2\$66o2\$66o2\$66o2\$66o2\$
66o2\$66o2\$66o2\$2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2ob23o\$2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2obo\$44b22o2\$46b2o2b2o2b2o2b2o2b2o\$46b
2o2b2o2b2o2b2o2b2o!
``````
A pair of them leaves the blocks with 0 offset, but of course consumes 4 rows of stripes.

Code: Select all

``````x = 64, y = 45, rule = B3/S23:T64,100-8
2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2\$32o4bo\$32bo
4bo2b2o2b2o\$26ob2ob2o4b2o2b2o2b2o\$27b2o4bo\$24o5b21o4bo\$50bo4bo2b2o2b2o
\$24o3b17ob2ob2o4b2o2b2o2b2o\$25b2o18b2o4bo\$24o2b16o5b17o2\$42o3b19o\$43b
2o\$42o2b20o2\$64o2\$64o2\$64o2\$64o2\$64o2\$64o2\$64o2\$64o2\$64o2\$2o2b2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2ob21o\$2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2obo\$44b20o2\$44b20o\$43bo\$44b20o2\$44b2o2b2o2b2o2b2o2b2o\$44b2o2b2o
2b2o2b2o2b2o!
``````
There's also a way to lay p4 blocks with the ants based zebra adder. Now just need a way to connect these parts up together to leave an unchanged boundary.

Code: Select all

``````x = 119, y = 29, rule = B3/S23
91bo\$87b2o2bo\$83bo2b3o3bob2o\$81b2obobo2bo3bo\$70b2o4b2ob2obob2ob4obo\$
68b2o3bob3o10b3obo\$65b2ob2o3bo18bo3b2o\$63b2o5b2o3b3obo2b2o9b6o\$60b2ob
2o10b2ob3o12b2o2b2o3b2o2b2o2b2o2b2o\$58b2o5b2o3b2o3b2o3bo11b3o3bo3b2o2b
2o2b2o2b2o\$3bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2b2o14b2ob2o8b2o5bo4bo
7b3obo6bo\$b40o12b2o5b2o3b2o2b3o3bo4b2obo3b4o2b25o\$o49b2ob2o8b2o10bo3bo
5b2o2bo2bo25bo\$b39o8b2o5b2o3b2o2b6o5b7o3b2o4b27o\$45b2ob2o8b2o12bobobo
7bo5bo\$b41ob2o5b2o3b2o2b17ob41o\$o42b2o8b2o63bo\$b39o5b2o3b2o2b64o\$48b2o
\$b41o3b2o2b69o\$o42b2o73bo\$b41o2b74o2\$b117o\$o117bo\$118o2\$118o\$o2bo2bo2b
o2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo
2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo!
``````
Any suggestions what to call a skimmer that leaves the boundary unchanged? Or perhaps a different name for these ones that do change the boundary.
The latest version of the 5S Project contains over 226,000 spaceships. There is also a GitHub mirror of the collection. Tabulated pages up to period 160 (out of date) are available on the LifeWiki.

Pavgran
Posts: 59
Joined: June 12th, 2019, 12:14 pm

### Re: 'Skimmers'

wildmyron wrote:
September 18th, 2020, 2:43 am
Any suggestions what to call a skimmer that leaves the boundary unchanged? Or perhaps a different name for these ones that do change the boundary.
Skimmers and trimmers, maybe?

wildmyron
Posts: 1447
Joined: August 9th, 2013, 12:45 am

### Re: 'Skimmers'

Getting closer - another p4 lightspeed trimmer.

Code: Select all

``````x = 92, y = 27, rule = B3/S23
59bo\$57bo2bo\$b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o9bo4bo3b2o
3b2o\$b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o6bo2b2obobo2b3o3b
3o\$48b3ob2obobobo3bobo2b2o3bo2bobo2b2o2b2o2b2o\$b48o5bo3b2o3b2o6b3o3b2o
2b2o2b2o2bobo\$o52b2o2bo3bo4bo2bo4bo16bo\$b45o4b3o5bob8o3b20o\$58bo11bo\$b
44obobo8b7ob2ob23o\$o45bo8b2o8b2o24bo\$b42o5bo3b2ob2o2b3o5b24o\$46bo3b2o
6bo\$b44obobo2b5o3b3o3b26o\$o57bo4b2o26bo\$b61o2b27o2\$b90o\$o90bo\$b90o2\$b
90o\$o90bo\$b90o2\$b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o!
``````
I like the name "trimmer" for these, but it doesn't really work for the ones that build up the agar, or change the type of boundary without changing where it is.

====

Edit Got it!

p4 lightspeed skimmer on the zebra stripes agar with blocks boundary:

Code: Select all

``````x = 128, y = 37, rule = B3/S23:T128,0
111bo\$107b2o2bo\$103bo2b3o3bob2o\$101b2obobo2bo3bo\$75b2o3b2o3b2o3b2o4b2o
b2obob2ob4obo\$73b2o3b2o3b2o3b2o3bob3o10b3obo\$70b2ob2o3b2o3b2o3b2o3bo
18bo3b2o\$68b2o5b2o3b2o3b2o3b2o3b3obo2b2o9b6o\$2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o25b2ob2o25b2ob3o12b2o2b2o3b2o2b2o\$2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o4b2o3bo13b2o5b2o3b2o3b2o3b2o3b2o3b2o3bo11b3o3bo3b
2o2b2o\$45bo3bo10b2ob2o8b2o3b2o3b2o3b2o5bo4bo7b3obo6bo\$43o15b2o5b2o3b2o
2b3o2b3o2b3o2b3o3bo4b2obo3b4o2b15o\$36bo5bob2o9b2ob2o8b2o25bo3bo5b2o2bo
2bo\$34o4b2obo11b2o5b2o3b2o2b21o5b7o3b2o4b17o\$38bo2bo8b2ob2o8b2o27bobob
o7bo5bo\$34o4bo9b2o5b2o3b2o2b32ob31o\$38bo6b2ob2o8b2o\$34o4b2obob2o5b2o3b
2o2b69o\$37bo5b2o8b2o\$40o5b2o3b2o2b74o\$48b2o\$42o3b2o2b79o\$43b2o\$42o2b
84o2\$128o2\$128o2\$128o2\$128o2\$128o2\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o!
``````
The latest version of the 5S Project contains over 226,000 spaceships. There is also a GitHub mirror of the collection. Tabulated pages up to period 160 (out of date) are available on the LifeWiki.

dani
Posts: 1008
Joined: October 27th, 2017, 3:43 pm
Location: New Jersey, USA
Contact:

### Re: 'Skimmers'

wildmyron wrote:
September 18th, 2020, 9:01 am
p4 lightspeed skimmer on the zebra stripes agar with blocks boundary:

Code: Select all

``````x = 128, y = 37, rule = B3/S23:T128,0
111bo\$107b2o2bo\$103bo2b3o3bob2o\$101b2obobo2bo3bo\$75b2o3b2o3b2o3b2o4b2o
b2obob2ob4obo\$73b2o3b2o3b2o3b2o3bob3o10b3obo\$70b2ob2o3b2o3b2o3b2o3bo
18bo3b2o\$68b2o5b2o3b2o3b2o3b2o3b3obo2b2o9b6o\$2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o25b2ob2o25b2ob3o12b2o2b2o3b2o2b2o\$2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o4b2o3bo13b2o5b2o3b2o3b2o3b2o3b2o3b2o3bo11b3o3bo3b
2o2b2o\$45bo3bo10b2ob2o8b2o3b2o3b2o3b2o5bo4bo7b3obo6bo\$43o15b2o5b2o3b2o
2b3o2b3o2b3o2b3o3bo4b2obo3b4o2b15o\$36bo5bob2o9b2ob2o8b2o25bo3bo5b2o2bo
2bo\$34o4b2obo11b2o5b2o3b2o2b21o5b7o3b2o4b17o\$38bo2bo8b2ob2o8b2o27bobob
o7bo5bo\$34o4bo9b2o5b2o3b2o2b32ob31o\$38bo6b2ob2o8b2o\$34o4b2obob2o5b2o3b
2o2b69o\$37bo5b2o8b2o\$40o5b2o3b2o2b74o\$48b2o\$42o3b2o2b79o\$43b2o\$42o2b
84o2\$128o2\$128o2\$128o2\$128o2\$128o2\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o!
``````
Here's an adjustable 8c/(108+4n) spaceship using it:

Code: Select all

``````x = 108, y = 39, rule = B3/S23:T108,1000-8
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o51bo\$2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o4b2o3bo37b2o2bo\$39bo3bo33bo2b3o3bob2o\$37o38b2obobo2bo3bo\$30bo5bob
2o9b2o3b2o3b2o3b2o4b2ob2obob2ob4obo\$28o4b2obo11b2o3b2o3b2o3b2o3bob3o
10b3obo\$32bo2bo8b2ob2o3b2o3b2o3b2o3bo18bo3b2o\$8o2b18o4bo9b2o5b2o3b2o3b
2o3b2o3b3obo2b2o9b6o\$9b2o21bo6b2ob2o25b2ob3o12b2o2b2o3b2o2b2o2b2o\$8o3b
2o2b13o4b2obob2o5b2o3b2o3b2o3b2o3b2o3b2o3bo11b3o3bo3b2o2b2o2b2o\$14b2o
15bo5b2o8b2o3b2o3b2o3b2o5bo4bo7b3obo6bo\$6o5b2o3b2o2b14o5b2o3b2o2b3o2b
3o2b3o2b3o3bo4b2obo3b4o2b21o\$3bo5b2o8b2o21b2o25bo3bo5b2o2bo2bo\$4b2obob
2o5b2o3b2o2b11o3b2o2b21o5b7o3b2o4b23o\$4bo6b2ob2o8b2o11b2o27bobobo7bo5b
o\$4bo9b2o5b2o3b2o2b6o2b32ob37o\$4bo2bo8b2ob2o8b2o\$4b2obo11b2o5b2o3b2o2b
73o\$2bo5bob2o9b2ob2o8b2o\$9o15b2o5b2o3b2o2b68o\$11bo3bo10b2ob2o8b2o\$2o2b
2o4b2o3bo13b2o5b2o3b2o2b63o\$2o2b2o25b2ob2o8b2o\$34b2o5b2o3b2o2b32ob25o\$
36b2ob2o8b2o27bobobo7bo5bo\$39b2o5b2o3b2o2b21o5b7o3b2o4b11o\$41b2ob2o8b
2o25bo3bo5b2o2bo2bo\$44b2o5b2o3b2o2b3o2b3o2b3o2b3o3bo4b2obo3b4o2b9o\$46b
2ob2o8b2o3b2o3b2o3b2o5bo4bo7b3obo6bo\$49b2o5b2o3b2o3b2o3b2o3b2o3b2o3bo
11b3o3bo\$51b2ob2o25b2ob3o12b2o2b2o\$54b2o5b2o3b2o3b2o3b2o3b3obo2b2o9b6o
\$56b2ob2o3b2o3b2o3b2o3bo18bo3b2o\$59b2o3b2o3b2o3b2o3bob3o10b3obo\$61b2o
3b2o3b2o3b2o4b2ob2obob2ob4obo\$87b2obobo2bo3bo\$89bo2b3o3bob2o\$93b2o2bo\$
97bo!
``````
she/her

dvgrn
Moderator
Posts: 7157
Joined: May 17th, 2009, 11:00 pm
Contact:

### Re: 'Skimmers'

dani wrote:
September 18th, 2020, 10:23 am
Here's an adjustable 8c/(108+4n) spaceship using it...
I wanted to try a spacefiller on a twisted torus with one infinite dimension, but Golly doesn't seem to support that -- or am I just doing something silly? Neither LifeViewer nor Golly seem to be happy with the ":T128,0+2" variant below.

So instead we get a thoroughly doomed spacefiller. Spacefillers in bounded universes are never particularly happy, I guess:

Code: Select all

``````x = 128, y = 32, rule = B3/S23:T128,256+2
93b3o3b2o\$90b6obo4bo\$87b2o6bo2bo\$61b2o3b2o3b2o3b2o4b2ob2obobob4o2bo\$
59b2o3b2o3b2o3b2o3bob3o9bob2obo3bo\$56b2ob2o3b2o3b2o3b2o3bo18bo\$54b2o5b
2o3b2o3b2o3b2o3b3obo2b2o9b3o\$51b2ob2o25b2ob3o12b3o5bo2b2o2b2o2b2o2b2o
2b2o\$49b2o5b2o3b2o3b2o3b2o3b2o3b2o3bo11b4o3b3o2b2o2b2o2b2o2b2o2b2o\$2b
2o2b2o2b2o2b2o2b2o2bobo21b2ob2o8b2o3b2o3b2o3b2o5bo4bo7b3obo\$2b2o2b2o2b
2o2b2o2b2o2bobo4bo14b2o5b2o3b2o2b3o2b3o2b3o2b3o3bo4b2obo3b4o2b29o\$25bo
2bobo10b2ob2o8b2o25bo3bo5b2o2bo2bo\$25o14b2o5b2o3b2o2b21o5b7o3b2o4b31o\$
18bo3bob2o10b2ob2o8b2o27bobobo7bo5bo\$15o4bo14b2o5b2o3b2o2b32ob45o\$19b
3o9b2ob2o8b2o\$15o4b3o7b2o5b2o3b2o2b83o\$19b2o5b2ob2o8b2o\$15o4b3o2b2o5b
2o3b2o2b88o\$17bo4bob2o8b2o\$21o5b2o3b2o2b93o\$29b2o\$23o3b2o2b98o\$24b2o\$
23o2b103o2\$128o2\$125ob2o\$124bob2o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b4o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2bo2bo!``````

Code: Select all

``````x = 128, y = 32, rule = B3/S23:T128,0+2
93b3o3b2o\$90b6obo4bo\$87b2o6bo2bo\$61b2o3b2o3b2o3b2o4b2ob2obobob4o2bo\$
59b2o3b2o3b2o3b2o3bob3o9bob2obo3bo\$56b2ob2o3b2o3b2o3b2o3bo18bo\$54b2o5b
2o3b2o3b2o3b2o3b3obo2b2o9b3o\$51b2ob2o25b2ob3o12b3o5bo2b2o2b2o2b2o2b2o
2b2o\$49b2o5b2o3b2o3b2o3b2o3b2o3b2o3bo11b4o3b3o2b2o2b2o2b2o2b2o2b2o\$2b
2o2b2o2b2o2b2o2b2o2bobo21b2ob2o8b2o3b2o3b2o3b2o5bo4bo7b3obo\$2b2o2b2o2b
2o2b2o2b2o2bobo4bo14b2o5b2o3b2o2b3o2b3o2b3o2b3o3bo4b2obo3b4o2b29o\$25bo
2bobo10b2ob2o8b2o25bo3bo5b2o2bo2bo\$25o14b2o5b2o3b2o2b21o5b7o3b2o4b31o\$
18bo3bob2o10b2ob2o8b2o27bobobo7bo5bo\$15o4bo14b2o5b2o3b2o2b32ob45o\$19b
3o9b2ob2o8b2o\$15o4b3o7b2o5b2o3b2o2b83o\$19b2o5b2ob2o8b2o\$15o4b3o2b2o5b
2o3b2o2b88o\$17bo4bob2o8b2o\$21o5b2o3b2o2b93o\$29b2o\$23o3b2o2b98o\$24b2o\$
23o2b103o2\$128o2\$125ob2o\$124bob2o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o
2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b4o\$2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b
2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2bo2bo!``````
EDIT: I was going to suggest "slimmer" and "shimmer" for the reducing and increasing skimmeroids, respectively -- referring to the meanings "to slim down" and "to shim up", not the meanings "skinnier" or "soft wavering light". But "trimmer" seems much cleaner for both, so I'm just going to hide this note here instead.

wildmyron
Posts: 1447
Joined: August 9th, 2013, 12:45 am

### Re: 'Skimmers'

dvgrn wrote:
September 18th, 2020, 10:49 am
dani wrote:
September 18th, 2020, 10:23 am
Here's an adjustable 8c/(108+4n) spaceship using it...
I wanted to try a spacefiller on a twisted torus with one infinite dimension, but Golly doesn't seem to support that -- or am I just doing something silly? Neither LifeViewer nor Golly seem to be happy with the ":T128,0+2" variant below.
I encountered the same limitation in Golly, so I don't think it's just you doing something silly.

Further thought on naming: on Discord it was pointed out to me that using the "to make fine adjustment" definition of trim means the name makes sense for both skimmers that add to and subtract from the agar. I had the other meaning stuck in my head. So trimmer and skimmer seem quite appropriate to me.
The latest version of the 5S Project contains over 226,000 spaceships. There is also a GitHub mirror of the collection. Tabulated pages up to period 160 (out of date) are available on the LifeWiki.

wildmyron
Posts: 1447
Joined: August 9th, 2013, 12:45 am

### Re: 'Skimmers'

A few trimmers on different agars. All of them are subtractive, unfortunately I couldn't find anything which was additive or close to being a skimmer.

p4 lightspeed trimmer on the chickenwire agar:

Code: Select all

``````x = 60, y = 17, rule = B3/S23
bo3bo3bo3bo3bo3bo3bo3bo3bo3bo\$obobobobobobobobobobobobobobobobobobo\$ob
obobobobobobobobobobobobobobobobobo2b3o\$bobobobobobobobobobobobobobobo
bobo3bobo2b2o\$3bobobobobobobobobobobobobobobobo9bo\$2bobobobobobobobobo
bobobobobobobobobo2bo\$2bobobobobobobobobobobobobobobobobobobo12bo3bo\$
3bobobobobobobobobobobobobobobobobob2o4b2ob3obobobobob2o\$bobobobobobob
obobobobobobobobobobobob2o2bo2bobobobobobobob2o\$obobobobobobobobobobob
obobobobobobobobo3bobobobobobobobo\$obobobobobobobobobobobobobobobobobo
bobobobobobobobobobobo\$bobobobobobobobobobobobobobobobobobobobobobobob
obobobobo\$3bobobobobobobobobobobobobobobobobobobobobobobobobobo\$2bobob
obobobobobobobobobobobobobobobobobobobobobobobobo\$2bobobobobobobobobob
obobobobobobobobobobobobobobobobobo\$3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo
3bo3bo2bob2o\$54b2obo!
``````
Several p3 lightspeed trimmers on an array of blocks with zebra stripes boundary:

Code: Select all

``````x = 56, y = 55, rule = B3/S23
2o\$2o\$4bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo3bo\$40obo\$o40bo\$b39o\$42bo10b
2o\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2obo2bo2bo2bobo2bo\$b2ob2ob2ob
2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob7ob3o2\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2o
b2ob2ob2ob2ob2ob2ob2ob2o\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o
b2ob2ob2o2\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o\$b2ob
2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o8\$3bo2bo2bo2bo2bo2bo
2bo2bo2bo2bo2bo2bo3bo\$b38obo\$o39bo\$b38o\$53b2o\$b2ob2ob2ob2ob2ob2ob2ob2o
b2ob2ob2ob2ob2obo2bo2bo2bobo2bo\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob
2ob10ob3o2\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o\$b2ob
2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o2\$b2ob2ob2ob2ob2ob2o
b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o
b2ob2ob2ob2ob2ob2ob2o8\$3bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo\$b40o\$o
40bo\$b38o\$40b2o\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o\$b2ob2ob2ob
2ob2ob2ob2ob2ob2ob2ob2ob2ob2o2\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o
b2ob2ob2ob2ob2o\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o
2\$b2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o\$b2ob2ob2ob2ob
2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2ob2o!
``````
The latest version of the 5S Project contains over 226,000 spaceships. There is also a GitHub mirror of the collection. Tabulated pages up to period 160 (out of date) are available on the LifeWiki.