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I must not have made my point very well. People have experiences which aren't material, physical experiences. Is it all in their heads? Most of it. Does that mean it's not real? No, there are things that exist beyond regular everyday predictable reality.

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If you’re suggesting that this guy is suffering from some kind of psychological, psychiatric, or neurological condition, then wouldn’t it still be the case that no one is floating around a room? That is, the problem would be with the observer, not the observed.

I'm not suggesting that the observer has a problem or condition. I'm saying that reality isn't just physical, and that we make a mistake when we expect everything to always be physically testable, even if to the observer it might seem at times to involve physical effects.

It’s not fundamentally untestable or unobservable though at the level of brain activity, which we could in theory measure with the right technology. It’s still physical unless you’re a proponent of dualism, which doesn’t make a lot of sense given current neuroscience or philosophy.

That's not quite what I'm getting at. Hallucinations are meaningful if you consider the narrative of life to be more important than the mechanism in which it plays out.

Further to that, the act of testing or observation isn't itself without its effects.

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