It's the description of Niggle's picture:
Quote:
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It had begun with a leaf caught in the wind, and it became a tree; and the tree grew, sending out innumerable branches, and thrusting out the most fantastic roots.
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("innumerable" and "fantastic" were the clues
)
I remember this because it reminds me of Tolkien's description in the foreword of how the LotR developped .