Concept
The View from Above
2 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
How to Think Like a Roman Emperor
How this book uses it: Imagine zooming out to see yourself from space - your problems shrink to insignificance. Use for perspective when overwhelmed.
Meditations
How this book uses it: Imagine seeing Earth from space - all human drama shrinks to insignificance. Perspective eliminates pettiness.