To switch analogies, the cerebellum contains the machine language. Our consciousness experiences only the refined upper levels - the GUI. Below these upper levels, where everything makes sense because it is forced to make sense, is a controlled hallucination that gets less controlled the deeper you force or guide your consciousness to go.

The blocks to letting your uptight consciousness go, and to going deeper, are both behavioural and neural (inhibition). But there are various methods to removing these blocks. There's external metaprogamming, the stimulation of internal biochemical systems, and even focused breathing - which coincidently is governed by a part of the pons.

Seeing bits of the hallucination in this state, but without control, is weird. Mystical even. Impossible to really describe except by analogy or projection. Which is where these related glimpses of other worlds come from. When you let go of the logical apparatus, you are stripping off self. You don't become unconscious, but you leave some of your consciousness behind.

The Pythia, or Delphic Oracles, that influenced the Greek world for 800 years, sat in a temple on the slopes of Mt Parnassus that was indirectly connected to volcanic chambers. There's an argument about whether these gases were ethylene, methane, CO2, H2S or benzene.

You can't be me, I'm taken