In Jeannette Walls' "The Glass Castle," the father explains to his children about the phenomenon of the fire's flames merging into heat that creates the illusion of shimmering, wavering desert scenery. This visual serves as a metaphor for a complex boundary in physics termed the boundary between turbulence and order. This concept suggests an area where traditional rules and expectations are not applicable, highlighting a sense of unpredictability and chaos.

Dad's remark about getting too close to this boundary reflects a moment of caution for his children, underscoring the idea that life can often be enigmatic and challenging to navigate. It hints at the complexities they face, implying that staying safe requires awareness and understanding of the delicate balance between chaos and stability around them.