Yes, this. They aren't strong at all. But if you're sort of out there from lots of years of psychedelic use you may be able to see some shifts in visual perception. Even comparing them to mushrooms may be an overstatement, but I know what you mean.
And my experiences that I'm referring to happened only after the 2nd or 3rd line. Not into a binge or anything. 200-300mgs. The psychosis visuals I've gotten in the past from Mephedrone, after lots continuous dosing I equate to something totally different. Those are the visuals I had brought onto myself by abusing the drug, staying up, not eating, all that jazz. But the weird little shifts at the beginning of the high were definitely real and not a sign of cut. I just think it may be like that for people with a little bit of HPPD or the people who look for weird things in their vision.