The quote suggests that appearances can be deceptive, and just because someone is looking at the sky at night does not necessarily mean they are an astronaut. It highlights the idea that outward looks or actions might not always reveal the true identity or role of a person. The statement encourages us to look beyond surface appearances and consider the deeper reality. In the context of the book "The Boy in the Striped Pajamas" by John Boyne, this quote can be interpreted as a reminder to question assumptions and understand the truth behind people's actions and appearances. It emphasizes the importance of not jumping to conclusions based on outward signs, as there is often more beneath the surface to discover.