Daniel C was  inspired by some artwork, so he programmed this in LOGO:  http://www.j2e.com/stmarks/bwilliams/Daniel+Cs+ultimate+pattern/

It’s an example of a mathematical never-ending picture called a fractal.

A fractal is a never-ending pattern. Fractals are infinitely complex patterns that are self-similar across different scales. They are created by repeating a simple process over and over in an ongoing feedback loop.

I remixed it using variables here  http://www.j2e.com/stmarks/bwilliams/Remix+Daniel+Cs+ultimate+pattern/

and made it into an animated GIF