In Thinking, Fast & Slow, Nobel winner Daniel Kahneman (click here previous post about Thinking, Fast & Slow) talks about the two selves people have: the experiencing self and the remembering self. The terms are self-explanatory and vacations are a good way to think about them. The part of us that is enjoying the vacation is the experiencing self, while the part that is reliving it later (sometimes years later) is the remembering self. Neither one may be more important, but the emphasis we place on one or the other could determine our behavior. So, for example, you can enjoy the vacation or take plenty of pictures to relive it later, depending on the self that is more important. A way of finding out which self is more important is to ask ourselves whether we would go on a certain vacation if we could only enjoy it, but not take any pictures (or video, etc).