Part 4 of Ralph Griswold's Drawdown Automata series, on choosing cellular automaton rules that generate attractive pattern sequences for weave design. It explains how to pick starting patterns (a symmetric 19-by-19 pattern and an asymmetric one) and which rules to avoid, such as the standard Game of Life, the voting rule and the 1-of-8 rule. It recommends four rules: the von Neumann and Moore parity rules and two Game of Life variations (Life /123 and Life /234). Figures show the pattern sequences each rule produces from the two starting patterns.