This one is quite literally a computer artefact. AKA., the product of an error in the filter's code.
I initially tried to generate a set of frames using the logo for the game Quadradius, and an "Array [mirrored]" filter in G'MIC-qt, but after generating several frames, it turned out it was generating them smaller and smaller, meaning some of the frames were just 2 pixels wide...
I then, for the heck of it, passed that to the Layer Median combination filter...
Given that filter tends to break horribly if differently sized layers are given to it (and I had layers from 2 px to 2000px !!), I was pleasantly surprised at the result !
Of course, I did polish the "error" slightly to push the colors, cut it down to shape and add some contrast (otherwise it was just a dark hyper-symmetric blob), so it's not a "pure" artefact creation ;)
