What is the theme in No Logo: Taking Aim at the Brand Bullies by Naomi Klein?

Loss of cultural space is the main theme. The marketing and advertisement environment in which huge conglomerates spend huge sums to spread brand awareness, identity, and loyalty, has resulted in the usurpation of society's "cultural space." Since the early days of advertising products, first in newspapers, then on radio and television, the evolution into marketing brands, rather than products, has resulted in an assault on our personal and public space, to include billboards on roads and highways and in elevators and restrooms.