I found a big paradox between what Harvey calls "the ephemerality of images" and the impact logos in advertsing (which are perhaps the most concrete examples of images that pervade every aspect of our lives). Just take this quiz to get a better notion of what I'm talking about: (I bet you'll be able to identify most, if not all, very easily, which I think proves how images are NOT as ephemeral as Harvey contends). http://www.logoquiz.net/
How do you think advertising fits into Harvey's model of the sped-up, impermanent postmodern world . . . how do you think logos can maintain power in a world so full of change and disposability??