That concluding sentence sounds as if he had been having a few drinks before and during writing the letter. Does it negate what he had just said, or does he mean that if you see anything beyond the basics (old man, boy, sea, fish, sharks) it is because you are seeing, as it were, your own knowledge/beliefs?
And of course we all bring our own experience, prejudices and so on to the book when we read it and interpret it.
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