What others have experienced in Room C002B depended on their cultural or religious beliefs. Some saw Jesus, the Virgin Mary, Muhammad, or the Sky Spirit. Others, with more than a passing faith in UFOs, tell of something that sounds more like a standard alien-abduction story.
That tends to fit my idea that hallucinations are usually caused by an altered state of the brain (mostly through chemicals) and thus is totally related to what is already inside our brain, ie a physical object. That would confirm that the brain is not really a metaphysical machine, but just a (complex) chemical, magnetic and electric machine.
“However, it is quite clear that the brain is also able to construct a version of reality that is quite unlike the survival-orientated ‘normal’, one. Now why on earth should it have evolved to do that and why is our culture so dead set against exploring it?”