Question

in Obama's speech...Yet, every so often the oath is taken amidst gathering clouds and raging storms...Is this an example of imagery...i feel this is appealing to sight...in analysing...the oath is taken place among a crisis in america...economical crisis and well as war

Answers

Yes, you're right. Those are metaphors: "gathering clouds" and "raging storms."
... and yes, metaphors are one type of literary device that produce imagery.

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