I got the idea from another cursor I'd seen back then, and the basic tail was based on it. I think I did the animated ones, the blue dot was my own addition, and the fox head is entirely my own creation.
It doesn't actually flicker in and out like that, it seems to be some quirk from recording it.
Wonder how many folks here have done the same thing, building and discarding in the throes of creation like tibetan monks:
https://en.wikipedia.org/wiki/Sand_mandala