!Name: Middleweight emulator
!Author: Robert Wainwright
!A period 4 oscillator that produces sparks similar to those of the middleweight spaceship.
!www.conwaylife.com/wiki/index.php?title=Middleweight_emulator
.......O
..OO.O...O.OO
..O.........O
...OO.....OO
OOO..OOOOO..OOO
O..O.......O..O
.OO.........OO