Eater/block frob

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Eater/block frob
x = 10, y = 10, rule = B3/S23 b2o$2bo$2bobo$3bobo$5b2ob2o$8b2o$2b2o$3bo$3o$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 500 THUMBSIZE 3 ZOOM 36 GPS 2 LOOP 4 ]]
Pattern type Oscillator
Number of cells 20
Bounding box 10 × 10
Period 4
Mod 4
Heat 8.5
Volatility 0.55
Strict volatility 0.55
Discovered by David Buckingham
Year of discovery Unknown
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Eater/block frob is a period-4 oscillator found by David Buckingham in 1976 or earlier.[1] Composed of an eater 1, a block, and what is roughly a melusine, it is essentially a tub-with-tail eater constantly being hassled. "Frob" is used by MIT as a generic term meaning "thing".[2]

The block can be replaced with a long hook with tail, and the eater 1 can be replaced with an eater bridge eater or an emulator.

Its grin makes it useful in the p4 bumper.

Carson Cheng found an 11-glider synthesis of this oscillator on June 30, 2022.[3] This was reduced to an 8-glider synthesis in August 2023 by MathAndCode, based on a 6-glider component that converts an eater 1 into this oscillator. [4][5]

Occurrence and variants

This oscillator first appeared naturally on April 3, 2022, in a soup found by Charity Engine using apgsearch,[6] though a seminatural C4_1 tetramerisation occurred on March 4, 2022, 30 days earlier,[7] in which each quadrant's eater head is fused to the roughly-melusine to form a roughly-fuse with tail and nine. The reduction of the 5 cells in the eater body and melusine tail seems to make it easier to find than the monomer, despite each quadrant having to occur at a fixed displacement from the centre. On May 17, 2022, Charity Engine also found a D8_1 oscillator, that contains the frob's rotor in each of its octants, with the roughly-melusine's eater tail's stabilisation fulfilled by gutter preservation, and has 4.5 fewer cells per octant than the monomer.

x = 16, y = 16, rule = B3/S23 oobbbboobbboboob$ obbobbbbboboobbo$ oobboooboboboboo$ oobbbbooobbbbbbb$ oboobbobobobbbbo$ oobobboobbbbbobo$ bobobobooboboooo$ oooboobobbbooobb$ bbobobbbbobbboob$ ooboooobbobobobo$ obobbboobbbbobbo$ booooobboobboooo$ bbbbbobbooobboob$ oboobbbbobobbbbb$ obobbboobbbooboo$ bbbobbobobbobooo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 HEIGHT 585 ZOOM 12 GPS 2 ]]
(click above to open LifeViewer)
x = 31, y = 31, rule = B3/S23 ooobbbobbooooooooobobboobbboooo$ oboboooobobbboobboboooboobbbobo$ ooooobobbbobboooboobbbboboobooo$ obbbboobobobbbooobooooobooobobb$ bbooobboboobboobbbbooooobboboob$ bboobbbobbooboboooobbbooobbobob$ bobobooobbbooooobboobbboobboooo$ ooobooobbbbbooooobbbooobooobbob$ obboooboobooobbobboobbobbbbobbb$ boboobbobbobbbobbobbbbbbbbobboo$ boboobbobbobobobobooooobboooobo$ ooboobobobobobooboobbboboobbbbo$ bbooboobobooobooooooobooobbbbbo$ ooobbobbboboobbobbbbbbboooobooo$ obbobobobbobobooobooooboobooooo$ obooboooobbooooooooobbooooboobo$ ooooobooboooobooobobobbobobobbo$ oooboooobbbbbbbobboobobbbobbooo$ obbbbbooobooooooobooobobooboobb$ obbbboobobbbooboobobobobobooboo$ oboooobbooooobobobobobbobboobob$ oobbobbbbbbbbobbobbbobbobboobob$ bbbobbbbobboobbobboooboobooobbo$ bobbooobooobbbooooobbbbbooobooo$ oooobboobbboobbooooobbbooobobob$ bobobbooobbbooooboboobbobbboobb$ boobobbooooobbbboobboobobbooobb$ bbobooobooooobooobbboboboobbbbo$ oooboobobbbboobooobbobbbobooooo$ obobbboobooobobboobbboboooobobo$ oooobbboobbobooooooooobbobbbooo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 HEIGHT 585 ZOOM 12 GPS 2 ]]
(click above to open LifeViewer)
x = 31, y = 31, rule = B3/S23 boobobobbboobobbboboobbboboboob$ obooobbbbbobooobooobobbbbbooobo$ ooboobobobbbobooobobbbobobooboo$ booboooooooobbbobbbooooooooboob$ oooooobobobbbobbbobbboboboooooo$ bbboobbbobobbobobobbobobbboobbb$ oboobboobobboobbboobboboobboobo$ bbbooboobbbbbbbobbbbbbbooboobbb$ bboobobbbobobooooobobobbboboobb$ bbbooboboboboooooooboboboboobbb$ oobobobbbooboobbbooboobbboboboo$ obbobbbbobbobobobobobbobbbbobbo$ boobbbobboobobbobboboobbobbboob$ oobboooboooobobbboboooobooobboo$ boobbbbboobbbbbobbbbboobbbbboob$ bbooboboooboobooobooboooboboobb$ boobbbbboobbbbbobbbbboobbbbboob$ oobboooboooobobbboboooobooobboo$ boobbbobboobobbobboboobbobbboob$ obbobbbbobbobobobobobbobbbbobbo$ oobobobbbooboobbbooboobbboboboo$ bbbooboboboboooooooboboboboobbb$ bboobobbbobobooooobobobbboboobb$ bbbooboobbbbbbbobbbbbbbooboobbb$ oboobboobobboobbboobboboobboobo$ bbboobbbobobbobobobbobobbboobbb$ oooooobobobbbobbbobbboboboooooo$ booboooooooobbbobbbooooooooboob$ ooboobobobbbobooobobbbobobooboo$ obooobbbbbobooobooobobbbbbooobo$ boobobobbboobobbboboobbboboboob! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 HEIGHT 585 ZOOM 12 GPS 2 ]]
(click above to open LifeViewer)

A similar replacement of the roughly-melusine to that in the D8_1 variant above can be achieved with a dimer with a tub. Two eater/block frobs can also hassle a beacon (that replaces the block for each), in either a cis- or trans- configuration, from which another D8_1 variant has also occurred seminaturally, with the eaters on the outside.

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Mark Niemiec (November 27, 2016). Re: Help with names (discussion thread) at the forums
  3. Carson Cheng (June 28, 2022). Re: Synthesising Oscillators (discussion thread) at the forums
  4. MathAndCode (August 18, 2023). Re: Synthesising Oscillators (discussion thread) at the forums
  5. shinjuku (#4895883719) (August 18, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  6. Ian07 (April 3, 2022). Re: Soup search results (discussion thread) at the forums
  7. attribute page, first soup

External links