text:  Well, let's start with a simple one, which has actually emerged from our research. We were brain scanning people who had taken the active ingredient of magic mushrooms, which is called psilocybin. Very commonly, people who take magic mushrooms and also other psychedelics like DMT or ayahuasca or LSD, they have visual hallucinations, which we call elemental hallucinations. They're very simple. They're bright lights like little jewels. They're often called Christmas tree hallucinations. And our imaging studies show