There's no difference between pulp fiction and highbrow fiction, one is as good as the other, the only difference is the aura they have, and that's determined by the people who read the stuff, not by the book itself. There's no such thing as 'the book itself.
Pop is about speaking everybody's language. The imagery and iconography we instantly recognize. When you can rely on things that the public already knows, you're dealing with Pop.
The minute we moved in (1712 North Crescent Heights), Dennis Hopper decided to give a party for Andy (Warhol), who was coming out to Los Angeles, and he decided that the one thing that would really make the house stand out, fabulously, would be billboards. So he papered the downstairs bathrooms with billboards. He had also decided that the food at the party would be hot dogs and chili. So we had a hot-dog stand! And Dennis had found huge papier-mâché Mexican figures with firecrackers hanging on them.
A nation lives by its myths and heroes. Many societies have survived defeat and invasion, even political and economic collapse. None has survived the corruption of its picture of itself. High and popular art are not in competition here. Both may help citizens decide what they are and what they admire. In our age, however, high art has given up speaking to the body of its fellow citizens. It devotes itself to technical displays that can appeal only to other technicians.