How does Rhoda Blumberg use imagery in Commodore Perry in the Land of the Shogun?

Examples of Imagery:

"Giant dragons puffing smoke. Alien ships of fire."
Chap. 1, p. 13

"A junction of East and West ... epaulettes and uniforms, shaven pates and nightgowns, soldiers with muskets and drilling in close array, soldiers with petticoats, sandals, two swords ... exhibiting the difference between our civilization and usages and those of this secluded, pagan people."
Chap. 11, p. 86