Sorry if this has been discussed before, I tried using the search button but it was extremely unhelpful?

I've heard it mentioned on this website, but I didn't hear an answer.

It seems possible to me, but I have a hard time believing that you could remember it or comprehend it in the waking life. I would think that your brain could trick you into thinking you can see a new color, but I'm not sure if you actually would be seeing a new color.