A feature by Clemens J. Setz

Several years ago, I had an appointment with a neurologist. There an EEG was performed. With a hairnet of electrodes on your head, you sit in front of a strong lamp, keep your eyes closed, and are subjected to flashes. The reaction of your brain to the flashing light, which flickers at an increasing frequency, is recorded by software. I don’t remember at how many hertz it was that I suddenly saw a spiral of falling gingerbread men. I told this to the assistant who was conducting the test. “I think I see gingerbread men.” To which she replied: “We’ll try one level higher, then it’s enough.” With the light now flashing marginally more rapidly, I still saw the incredible image behind my closed eyelids: falling gingerbread men, millions of them, a whole cosmos full. I had to open my eyes, because the sight was making me dizzy.