Sonder
sonder - n. the realization that each random passerby is living a life as vivid and complex as your own.
When you finally open your eyes and see that they are not just supporting characters made up in your imagination to stop you from feeling alone. That other people; you family, your friends, that women that talks way too loud on the bus, and the cab driver that charges too much; that they are all living a scintillating life. That they all have cried, and laughed, and felt loss and pain. That they have a family or feelings just as you do. That they don't simply fade away once you walk off. That the people in the background are the stars of their own life. That you are not the only person who feels, and loves, and cares, and hates, and hurts, and cries. That you are not the only thing keeping their luster glowing. That they keep shining and living long after you've gone. That you are just a supporting character within their life. That you were once a background character walking by with your phone in one hand. That you fade away to them once you have left.
Sonder - the realization that you are not the only person who lives.