"One thing's for sure, whatever it is, whatever label anyone wants to put on it, it's more than incredibly pleasant and often profound, I'm up for it anytime."
Yes - that is so. To function effectively in my everday world I have had to be rational, material and sceptical. Other perceptions have "happened" when I have been stressed, sick, exhausted, elated, emotional, distressed or moved by great art, music and megaliths.
So that is why I ask myself is it an illusion produced by chemical and neurological changes within me - or is it an external phenomenon that I can only perceive when I am in an altered state of consciousness? ie the old cliche about a radio tuning in to a station - the radio waves are constantly there, but you can only perceive them if you tune your radio to the appropriate wavelength.