The following reaction between a spark such as a donut, plus, or crosshairs and an anchor, which produces a rectangular pattern of four dots. Notable because a pair of free ships can convert the pattern of dots into a trail of monsters at any period 6n for n greater than 3, which has enabled the creation of the first monster puffer. Named for the appearance of the seventh generation.

Liberty Bell reaction.png

x = 5, y = 9, rule = s0/b2