polybius was an urban legend of an arcade machine that hypnotized people. idk, it might be related. even if not its a pretty fun deep dive 

but they're pretty similar. they both had spiralling or "hypnotic" visuals and very little information about them (honestly with how much info you guys have managed to pull up about the ito machine im surprised its not more popular than polybius, which is pretty much built off rumors) . they also share the headache/hallucination-inducing factor.

interestingly though polybius was (supposedly) released in 1981 which is before the junji ito machine would have existed (i think, i need to do more research). so maybe the ito machine was some kind of spiritual successor? 

so yeah. not sure if this is at all useful but i wanted to provide info on it just in case. ill probably interact with these forums more, so its nice to meet you all.