A detail from the pattern generated by a cellular automaton with totalistic code 1635. (See page 67; see also color version.)
Evolution of a 3D cellular automaton. (See page 183; see also color version.)
Patterns from sequential substitution systems based on repeated rewriting of strings. (See page 91.)
Discrete packings of circles. (See page 987.)
Regular forms in biological systems. (See page 385.)
Heather pollen, daisy.
Romanesco broccoli, coccolithophorid.
A stage in the construction of a causal network. (See page 489.)
Networks that do not overlap, and so can yield causal invariance. (See page 515.)