!Name: Lightweight emulator
!Author: Robert Wainwright
!A period 4 oscillator that produces sparks similar to that of the lightweight spaceship.
!www.conwaylife.com/wiki/index.php?title=Lightweight_emulator
..OO.O..O.OO
..O........O
...OO....OO
OOO..OOOO..OOO
O..O......O..O
.OO........OO