Unseen hands push me down into the beanbag, making sure I’m nestled deep into its folds. Then, from the dark, a reassuring American voice. “Just relax,” it says. “You’re about to have a mushroombased experience.” I spend the next ten minutes floating through forests, tracing lines of white light with my hands, watching explosions of pudgy molecules like fireworks made of clay… before coming back down to earth. Specifically, a repurposed warehouse along the banks of the Thames – the
