Awe is not an everyday emotion. You don't wake up awestruck. A satisfying lunch doesn't leave you filled with awe. Even a great day is unlikely to leave you in a state of jaw-dropped, consciousness-opening fear and trembling. Perhaps that's why, up until about ten years ago, psychology "had surprisingly little to say about awe," wrote Dacher Keltner and Jonathan Haidt in a 2003 paper. The two psychology professors aimed to outline the key qualities of an awe-inspiring encounter.