I found myself in a labyrinth of staircases. This labyrinth was open to the sky in places. I climbed up; other stairs led downward. On one landing I realized I was standing on a kind of summit, with a wide view across open country. I noticed that others stood on other peaks. One of these people was suddenly seized by vertigo and began falling. A feeling of light-headedness spread; others toppled from other summits into the depths. Everyone was laughing. When I, too, was overwhelmed by this giddiness, I woke up.