Illuminated Signs

This is an old one. Not sure how old, though:(

I am standing at the top of a large auditorium or theater, which slopes steeply down toward a tall screen, as wide as a full-sized movie screen, but even taller than it is wide. The theater is in darkness, and I am alone. I think that I don’t know what to do. A disembodied voice says, “Read the illuminated signs in front of you, and fly.” A mysterious, intricate pattern appears on the screen, and I fly into it.