Philip Galanter is an artist, theorist and curator, and a professor emeritus at Texas A&M University. His work explores complex systems, generative art, sound art and art theory, bridging the cultures of science and the humanities.

I go with him defining generative art as any kind of art practice in which the artist uses a system, set in motion with some degree of autonomy, thereby creating or contributing to a completed work of art.
Christiane Paul, Christiane Paul on Curating Cohen’s AARON
Galanter talks about how this is an example of tiling, and it's also one of the first known works of art created by a human.
Peter Bauman, Marius Watz on Pre-Modern Generative Art