How does Aldous Huxley use imagery in Island?

Imagery:

"And as he spoke he was seeing, in a vision as brief and comprehensive and intensely circumstantial as a drowning man's, all the hateful scenes he had witnessed in the course of those well-paid pilgrimages to every hellhole and abattoir revolting enough to qualify as News. Negroes in South Africa, the man in the San Quentin gas chamber, mangled bodies in an Algerian farmhouse, and everywhere mobs, everywhere policemen and paratroopers, everywhere those dark-skinned children, stick-legged, potbellied, with flies on their raw eyelids, everywhere the nauseating smells of hunger and disease, the awful stench of death."