If you’ve ever listened to someone tell you about their psychedelic experience, there’s a good chance you’ve heard how they felt like they were ‘one with the universe’, or how they were ‘one with nature’, rather than simply observing it. This feeling of oneness and continuity between the self and the world around you has become a trademark feature of the psychedelic experience, and it helped fuel the cultural movement of the psychedelic 1960s.