Ayahuasca is driven by sound, by song, by whistling. And its ability to transform sound, including vocal sound, into the visual spectrum indicates that some kind of information processing membrane or boundary is being overcome by the pharmacology of this stuff. And things normally experienced as acoustically experienced becomes visibly beheld, and it's quite spectacular.
Terence McKennaThe shaman is not merely a sick man, or a madman; he is a sick man who has healed himself.
Terence McKennaThere's something in the Western mind that gets very nervous when you try to talk about the bedrock of ontology.
Terence McKenna