This explanation of the work the automata rule needs to do was interesting: http://mrob.com/pub/math/quad-grid-glider.html http://mrob.com/pub/math/quad-grid-gl

This explanation of the work the automata rule needs to do was interesting: http://mrob.com/pub/math/quad-grid-glider.html http://mrob.com/pub/math/quad-grid-glider.html (from g+)