Another poetic allusion in David Mitchell's Bone Clocks

Rare Iceland Forest
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Here's another literary allusion that Mitchell works into his own literary work:

HALFWAY ALONG OUR JOURNEY to life's end I found myself astray in a dark wood. This fork in the path, these slender birches, that mossy boulder tilted upwards, like a troll's head . . .

Most readers will recognize the allusion, so I won't insult anybody's intelligence by spelling it out, because - "Damn anything new to everyone!" - you ought to know already . . .