Using the words in unusual combinations makes what the writer wants to say more meaningful. The use of words provides the reader with an idea or mood by creating images in your mind.

"The moon was a ghostly galleon, tossed upon stormy seas."
AND
"The moon's a balloon."

Both of these statements about the moon use figures of speech.

We know that the moon is neither a ghostly ship or a balloon, but by using these figures of speech the poets are able to instantly create different moods and could provide insight to the setting.

What is the effect of the use of these devices on the reader?

Figurative language

What Lit. Devices are used?