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4b2o3b$2obobo3b$2obo5b$3bo5b$3bo2bo2b$4b2obob$7bob$7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 GPS 2 ]]
Pattern type Oscillator
Oscillator type Muttering moat
Number of cells 18
Bounding box 9×8
Frequency class 41.6
Period 3
Mod 3
Heat 2
Volatility 0.14
Strict volatility 0.14
Rotor type Cuphook
Discovered by Rich Schroeppel
Year of discovery 1970

Cuphook is a period-3 oscillator that was found by Rich Schroeppel in October 1970.[1][2] It is one of only three essentially different period 3 oscillators with only three cells in the rotor. The others are 1-2-3 and stillater.

The name cuphook has long been associated with the trans isomer (more accurately, trans-block on cuphook), as shown in the infobox. The cis isomer of this oscillator (cis-block on cuphook) first appeared naturally on March 15, 2015, in a soup submitted to Catagolue by Adam P. Goucher.[3]


cis-block on cuphook


  1. Robert Wainwright (March 1971). Lifeline, vol 1.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. gameoflifeboy (March 15, 2015). Re: Soup search results (discussion thread) at the forums

External links