Insane Fractal Looping

This is by far one of the best fractal gifs I've ever seen. High quality and a perfect loop!

Well that was an amazing 2 minute acid trip, thank you Internet stranger.

It's so hard to look away

This makes me strangely anxious.

How is this made?

SUPER high quality.

It's a hybrid 3d fractal. Looks like a menger sponge and a circular or doughnut function. It's probably an example in the program http://www.mandelbulber.com

...tesseract?

I imagine that this is what an object rotating in the fourth dimension would look like.