I was lying on a lumpy off-white sofa under a mountain of blankets, wearing an eye mask and listening to a Brahms symphony playing through my headphones. The notes of a violin solo lit three strands of deep red light, which trickled like water in my right visual field. Deeper tones poured from above in huge blue clouds in the middle distance. Another violin flourish turned the sky yellow and brought with it a comet's tail of body parts flying from the upper left of my visual field to the lower right, disappearing behind me.