In the book "Jitterbug Perfume" by Tom Robbins, the author explores the concept of the psyche's boundless potential for exploration. It suggests that our minds can traverse limitless dimensions of time and space, unimpeded by external constraints, but ultimately, our personal inhibitions serve as a gatekeeper. This indicates that while we can journey mentally and creatively, our return to everyday consciousness is filtered by our own restrictions.

Robbins highlights the idea that although the psyche is free to roam and gather experiences, the process of re-entry into normal life is conditional. The "customs inspector" represents our internal barriers, which determine what we can safely incorporate into our daily existence. This metaphor emphasizes the tension between the richness of imagination and the limitations imposed by societal norms and personal fears.