 He attempts to show readers how to perceive reality outside their own experience and embrace such paradoxical questions by rejecting the premise—a strategy also called "unasking".Elements of computer science such as call stacks are also discussed in "Gödel, Escher, Bach", as one dialogue describes the adventures of Achilles and the Tortoise as they make use of "pushing potion" and "popping tonic" involving entering and leaving different layers of reality.Subsequent sections discuss the basic tenets of logic, self-referring statements, ("typeless") systems, and even programming.