“Imagination Motel: Pomes With Many Bags of Buttered Popcorn and Big Pepsis” is a large book, a dense book, a prose writer’s poetry. It is also a movie, a black-and-white Western, a campy Tarzan, Invasion of the …. It is music and the visceral landscape of neon, soundtracks, blue screens, radio waves and Frida Kahlo — cheap motels, weed, bars, sex, guns, cars.