Chapter 6: Starting from Randomness

Section 8: Structures in Class 4 Systems

[Structures in] other 2D cellular automata

The general problem of finding persistent structures is much more difficult in 2D than in 1D, and there is no completely general procedure, for example, for finding all structures of any size that have a certain repetition period.

Image Source Notebooks:

From Stephen Wolfram: A New Kind of Science [citation]