So as you are appreciating a beautiful smile, all is still in harmony. As you are acknowledging your own value or strength or clarity, as you are basking in something in your now, there is only harmony, and you can feel it. You feel that you have changed the frequency. You are no longer in harmony with who you really are. You've just gotten off your path.
Lack is really a physical thing.
It doesn't exist anywhere else in the Universe. It's only in the physical. Any time you start wanting, you summon Energy. Any time you identify something as an object of your desire, the entire Universe begins to flow, through you, toward your object of attention. It is a powerful thing.