In this chapter, the Underground Man explains the concept of the "air gear" and how he intends to use it to his advantage. He explains that he wants to be able to see the road ahead, even if he does not have a "regal" . The Underground Man also explains that there is no way to know that only those who use the air gear correctly can use it. This is because the sky and the ground are the only things that exist, and the only thing that can be done with them is to destroy them.