@The Pentacle Queen,
I don't know Queeny.
Art requires a spark of inspiration.
The memories of a trip can be just such a spark.
The brain is a complex organ driven by a complex mixture of chemicals and electrical impulses.
If you are "lucky" enough to be born with the proper mixture for artistic genius, you are probably also going to be in for an ear slicing episode somewhere down the line.
I think it's pretty amazing that man can mess with the mix, and why should the results be any less valuable then what genes, unaided, can deliver?