alt Hacker News> People don't see math or electricity with their eyes and it is simultaneously hard to argue that their physical counterpart doesn't exist. Your examples are things you can't see but exist.
How is that different from psychedelics? We can "see" their physical counterparts (and chemical reactions) in people's head and body as they trip too.
I have a camera. Suppose I rub course-grained sandpaper all over its lens. Now the camera sees scratches, instead of the outside world. But those scratches are real! We can see their physical counterparts if we study the camera. Clearly, the camera has been much improved.