Sonder is defined as the realization that each random passerby is living a life as vivid and complex as your own. Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this, you might enjoy.
Sonder is not a "real" word as it is not in any of the standard dictionaries. It's in Urban Dictionary, which is pretty standard to me because the definition of Lena makes me sound like I have myself together, which I obviously do (some restrictions may apply).
Lena: A very bubbly person, and so beautiful. Caring too. She gets a lot of attention, but she doesn't even realize it, which is something amazing about her. She's sometimes in her own little world, and everyone wants to be a part of that . . . She's very fun and funny. It's always a pleasure to be around her. She can handle any situation well, and knows how to plan . . . She's the whole package!
I like the concept of sonder. Everyone is the main character in the movie of their life, even if they are just an unnamed extra in mine. Wondering what these random strangers life might be like feeds my imagination. When out and about I often make up stories about the people around me. Sometimes I don't have to make up stories because for some reason beyond my understanding total strangers will tell me about their life. Maybe I just have that kind of face or maybe it's because I listen, usually without judgment.
Overhearing part of someone’s conversation allows a glimpse into a total stranger’s life. Peeking into a stranger’s life is a sonder moment. I find it exhilarating. I’m a voyeur in that sense. If you’re a voyeur too, you may enjoy the web serial I have in the works called The Girl About Town. There will be many sonder moments in the coffee shop where tourists’ conversations and phone calls are overheard. There will also be interesting and socially relevant discussions from the staff and regulars.
I hope to have the first part of the serial to share with you soon.