I am reading Stephen Wolfram's "A New Kind of Science".
At present, I cannot understand how the cellular automata illustrations on p79 are created.
In the patterns, the active cell, representing the head, appears to change orientation between up and -45 degrees (towards bottom right). However, none of the rules seem to include an active cell with an orientation other than up or down. How does the active cell orientation of -45 degrees come about in the patterns?
Am I missing something obvious (I am a beginner in this area)?