kolibrios/programs/demos/life2/lif/CRYSTAL.lif

#Life 1.05
#D Crystal&decay 2700
#D
#D A p150 gun fires at a pair of pentadecathlons.  When the first glider
#D hits the PDs, it is reflected back and hits the second, forming a
#D honey farm.  Subsequent gliders form a crystal growing upstream.  When
#D the crystal reaches an eater near the gun, it begins to decay.
#D When it's all gone, the cycle begins again.
#D
#D The period of this pattern is 2700, but by moving the PDs, any period
#D of the form  750 + 1950n  (n>=0)  can be obtained.
#D Dean Hickerson, dean@ucdmath.ucdavis.edu  3/27/90
#N
#P -14 -23
**
**
#P -17 -19
...*
..***
.*...*
...*
*.....*
*.....*
.*...*
..***
#P -19 2
**...**
.
.*...*
..***
..***
#P -16 11
**
**
#P -4 -13
**
**
#P 5 -16
**
*.*
.***
..***
.***
*.*
**
#P 17 -14
....*
.****
****
*..*
****
.****
....*
#P 30 -11
**
**
#P 13 9
...*
.***
*
**
#P 1 19
**
*
.***
...*
#P 45 47
..**......**
.*..*....*..*
******..******
.*..*....*..*
..**......**
#P 40 59
***
*.*
***
***
***
***
*.*
***
#P -14 -4
..*
*.*
.**