I had it now trice in my life that I had repeatable specific visual when I was not tripping. It was always outside and it was limited to one or more specific objects of the same type. The first was at fuerte ventura airport I was looking between two bars of a fence and a object in very far distance came into my focus, like zooming with a camera. There I had of plenty of time so I did walk around and after a while tried to watch this again and at the same spot I got the same sensation. The second one I noticed only once, I was walking on the sidewalk with flagging and they got kind of 4D (can't really describe it). The third time was after my first attempts of smoking DMT (like 1 hour passed after it) and I was feeling completely normal. I collected my girlfriend from the subway and on the way to there had been a row of banner advertisement on the wall of a building. They weren't animated but had a background light inside the frame. While passing on at some distances the light got seperated like in a prisma. So the commercial was surrounded by red, blue and green outside the frame. On the way back I got exactly the same sensation. And it didn't go away while watching it. I mean sometimes you s.th. in the corner of the eye and when you focus it it's gone, that's quite normal. But this sensations I could watch and they still persisted, even from different angels etc.

The strange thing is that these sensation firstly were all repeatable secondly just a type of objects was abnormal. I think if you have a flashback than everything should be different?