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Figure: : Evolution from a joined (gap 0) pair.
Many evolutionary rules are distinguished by the presence of numerous inverted triangles in their space-time diagrams. The evolution of pure cycles shows them to especial advantage, often exhibiting a fractal structure. Indeed, strings of any arbitrary format can be expected to show up occasionally; but quiescent strings are of particular interest because they can only disappear gradually, as live cells encroach on their boundaries. Triangles are the visual evidence of the eventual regrowth of the live region, evident in Figure .