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|Oscillator type||Muttering moat|
|Number of cells||16|
|Bounding box||6 × 6|
|Discovered by||Robert Kraus|
|Year of discovery||1971|
Quad (or barberpole intersection) is a period-2 oscillator and muttering moat that was found in April 1971 by Robert Kraus. It has the same rotor as the clock. It and mold are the only flippers that fit inside a 6 × 6 bounding box; however, mold is period 4.
This oscillator first occurred naturally on December 28, 2015, in a soup submitted to Catagolue by Adam P. Goucher. A 12-glider synthesis was constructed the day following its occurrence by Tanner Jacobi.
Information on this oscillator's natural occurrence with respect to other naturally-occurring patterns is currently unknown.
Despite having fourfold symmetry, quads typically form via twofold symmetry only. As shown below, there are two lumps of muck in the center, and the two outside objects shown can be anything with the same front two rows that does not interfere later.
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RLE: here Plaintext: here
- Quad at the Life Lexicon
- Quad at Adam P. Goucher's Catagolue
- The 98 sixteen-bit period 2 oscillators at Mark D. Niemiec's Life Page (download pattern file: 16/16qd.rle)
- 16P2.19 at Heinrich Koenig's Game of Life Object Catalogs