In Canto Three of his poem John Shade (the poet in VN’s novel Pale Fire, 1962) wonders if he should stop investigating his abyss and mentions a web of sense:
Life Everlasting – based on a misprint!
I mused as I drove homeward: take the hint,
And stop investigating my abyss?
But all at once it dawned on me that this
Was the real point, the contrapuntal theme;