It looks like a glitch, but it's really not.
I've never seen anybody do this kind of thing in apo before so I'll talk about it a bit:
Basically what you need is a variation that inverts the plane (spherical, moebius, y, cpow, julian) in a loop with itself (i.e., a single transform feeding into itself ad infinitum or some xaos setup where you have two transforms feeding into eachother without feeding back into themselves. Then, you "disrupt" the loop in some small way: A postlinked linear-based transform (this one uses rectangles; I've also had fun with collideoscope, linear+epispiral, waves2...), a slight change in the variables, a post_variation, adding a small amount of some regular variation, adding some low-weight cylinders or bubbles to fill things out, or maybe just offsetting one of your original transforms slightly. Not all of these disruption methods work with all loop setups though.
The drawback is that because these are loop-based with a relatively low number of transforms, they are extremely hard to color. In this one, the blue comes completely from chaotica's negative background color, for instance. I've also brightened it up quite a bit.
This isn't the first time I've uploaded something like this, either, so I made a folder for it.