Theory:

Imagery as a poetic device refers to the usage of verbal images to describe a concept. An image is thus any vivid or picturesque phrase that evokes a particular sensation in the reader's mind.
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A girl visualises the text she is reading
Imagery uses imaginative language to represent objects, actions, and ideas in such a way that it appeals to our physical senses. A writer helps the reader to visualise or to see in their minds what is being described. The poem is said to have imagery if it describes senses such as the sight, sound, smell, taste, and/or feel of something. As a result, the images should appeal to one or more of the five sensory organs: eyesears, nose, tongue, or skin.
 
Imagery helps the readers understand the literary work better. The concept is made easier to understand and remember as the readers are made to visualises it.
Example:
1.It was dark and dim that night.
    The words “dark” and “dim” are visual images; (that appeal to our eyes).
 
2. The kids were screaming and laughing in the classroom.
     “Screaming” and “laughing” appeal to our sense of hearing; (that appeal to our ears).

3. Rani whiffed the fragrance of the fresh rose blossoms.
    “Whiff” and “fragrance” evoke our sense of smell; (that appeal to our nose).
Imagery used in the poem "Whatifs":
  1. Last night, while I lay thinking here. (sight)
  2. Some Whatifs crawled inside my ear. (sight and touch)
  3. Pranced and partied all night long. (sight and sound)
  4. Whatif I get beat up? (sight and touch)
  5. Whatif green hair grows on my chest? (sight)
  6. Whatif my head starts getting smaller? (sight)
  7. Whatif a bolt of lightning strikes me? (sight)
  8. Whatif the wind tears up my kite? (sight and sound)
  9. Whatif my teeth don’t grow in straight? (sight)
  10. Whatif I tear my pants? (sight and sound)