How does Maya Angelou use imagery in I Know Why the Caged Bird Sings?

Imagery:

“The lamplight in the Store gave a soft make-believe feeling to our world which made me want to whisper and walk about on tiptoe.”

"the dirt of the girls’ cotton dresses continued on their legs, arms, and faces to make them all of a piece.”

“She printed voile dresses and flowered hats were as right for her as denim overalls for a farmer.”