How does Marguerite Henry use imagery in King of the Wind?

Imagery:

"Agba leaped to his feet. He wanted to climb the tower of the mosque. He wanted to blow on the trumpet. He wanted to cry to the four winds of heaven: 'A foal is born. And he will be swift as the wind of the desert, for on his hind heel is a white spot. A white spot. A white..."'

"Perhaps if he slept he would be lost in a dream, and the prison walls would fall away and he and Sham would be together again. Perhaps in his dream he would be grooming Sham, going over the wheat ear quickly, then lingering long on the white spot."