I cannot hope to describe what it was but it had frightened me very much long before I had understood it even slightly. It was some change which came upon me or upon the room, indescribably subtle, yet momentous, ineffable. It was as if the daylight had changed with unnatural suddenness, as if the temperature of the evening had altered greatly in an instant or as if the air had become twice as rare or twice as dense as it had been in the winking of an eye; perhaps all of these and other things happened together for all my senses were bewildered all at once and could give me no explanation.
