This week's featured article
|Pentadecathlon is a period-15 oscillator that was found in 1970 by John Conway while tracking the history of short rows of cells (see one-cell-thick pattern). Indeed, 10 cells placed in a row quickly evolve into this object, which is the most natural oscillator of period greater than 3. In fact, it is the fifth or sixth most common oscillator overall, being about as frequent as the clock, but much less frequent than the blinker, toad, beacon or pulsar. It is the only known oscillator that is a polyomino in more than one phase (besides the blinker).
In the news
- April 11: David Raucci finds a new period-76 dual pi hassler oscillator, which is quickly reduced to a monomer form by JP21, A for awesome, and Matthias Merzenich.
- April 10-14: Goldtiger997 completes a 152-glider synthesis of a third c/4 orthogonal spaceship, 61P4H1V0.1; within four days this was reduced to an 89-glider synthesis.
- March 18: Results for the 2020 Pattern of the Year competition include a tie for first place between the Bandersnatch and the Speed Demonoid.
- March 17: A small synthesis efficiency improvement project, 12-in-7 (12-bit still lifes constructed with 7 gliders or less) is completed, with 13 expensive syntheses reduced to below the target cost in less than a week.
- March 17: Pattern of the Year voting, on a record-breaking thirty-nine entries for 2020, will close on March 17th.
- March 12: The 20-bit still life glider synthesis project is completed.
- March 7-8: Goldtiger997 completes a 215-glider recipe for 72P4H1V0, the second c/4 orthogonal spaceship to be synthesized.
- February 10-11: Chris Rowett uses ikpx2 to discover several new moving objects, including a p120 2c/5 puffer and c/5 diagonal tubstretcher, tagalong, and spaceship.
- February 4-11: Tanner Jacobi, EvinZL, Louis-François Handfield and Sphenocorona find new Herschel-to-glider converters and variants of existing H-to-Gs: NW26T157b, NE30T17_NE1T22, NW10T137, SW-18T136 and a Spartan SE16T36b.
- January 11-March 8: Hartmut Holzwart completes several new chicken wire greyships with different widths of chicken wire, with specific examples constructed for widths 2 through 12 among others.
|The LifeWiki contains one of the most comprehensive catalogues of patterns available on the internet. Within it you will find:
Did you know...
- ... that to display the smallest known gun pattern for a Gemini spaceship at 1 cell = 1 pixel, on a standard-density video monitor, a screen over one mile square would be needed?
- ... that no odd-period glider guns were known before 1995, when a period 565 p5-spark-assisted B-heptomino loop was constructed by David Buckingham?
- ... that even though the speed limit for spaceships is c/2 in a vacuum, in a medium of stripes agar there are "spaceships" that can travel at lightspeed along the stripes, or two thirds of lightspeed perpendicular to the stripes?
- ... that the smallest known spacefiller pattern consists of 183 cells?
- ... that the smallest known sawtooth pattern in Conway's Life consists of only 177 cells?
- ... that there are now over a hundred and seventy known Herschel conduits, counting stable conduits only, and a much larger number if oscillator-supported conduits are included?
- ... that Demonoids, Caterloopillars, Orthogonoids, half-bakery knightships, loopships and camelships are the only known types of spaceships with fixed slope but adjustable speed -- not counting 0E0P metacell-based patterns?
- ... that a pattern exists in which no cell in the unbounded Life plane ever becomes periodic?
- ... that several different universal constructors in Conway’s Life have been shown to be capable of constructing their own circuitry?
- ... that there are dozens of known Cordership variants, including puffers, rakes and wickstretchers, with periods of any multiple of 96?