Psychonaut: from Ancient Greek – ψυχή psychē ‘soul, spirit, mind’ and ναύτης naútēs ‘sailor, navigator’: a person that is a self-professed “navigator of the soul, spirit or mind; someone who uses methods or substances to explore the personal interior or collective exterior of consciousness.
There isn’t a definition in the dictionary as to what a psychonaut actually is. As far as the internet goes, that’s a different matter.
Mondo Arcadia is a tale of psychonauts who have found themselves central to the activity and narratives of the sixties.