that's not what i meant by experience-based-- i suppose that was the wrong term to use. sensory-based, i suppose, would be more accurate. if you've never experienced a particular sensory input (sound, light, taste, smell, touch) you won't experience it in your dreams. i know this because A) it's been a subject of curiosity for me for several years, and i've done some reading on it and because my younger cousin was born blind and i've had extensive discussions with him due to my curiosity. he's just one case though-- so it's really the reading i'm relying on as my source. he has a difficult time describing himself sometimes too, so it's not always very clear the difference between what he means and how i understand it.
Did he ever describe to you what he 'sees'?
Does his mind create any kind of replacement for the lack of sight? Say using sound waves bouncing off objects to create a 3 dimensional imagine of depth in his head?
I've read an article about how blind people use a type of sonar type click to do something similar to this.
I've always been really fascinated in all of that