Holistic thinking isn't complicated. It's the realization that each part of your life effects every other part. If you feel great about your job and your bank balance is OK -- but you hate your flat -- then your whole sense of well-being is disturbed by one element.
Our lives are often busy, and in the rush of a day, it's easy to lose sight of who we are and who we want to be. Mementos can help us keep on an even keel and remember the roles we strive to fill. A reasonable number of reminders is best, as too many leads to visual, olfactory, and audio overload.