The line "Tutankhamen is a drop of water in the ocean of history" contains a type of figurative language called metaphor, as is further explained below.
With the information above in mind, we can identify the use of metaphor in the line by Lewis. She states that Tutankhamen is a drop of water in the ocean of history, comparing the young pharaoh to a single drop of water.
Her purpose with such a comparison is to show that, in terms of all history, Tutankhamen's story is quite small, maybe even insignificant.
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