Sonder, a poetic word, is apparently not a real word, but a product of a tumblr post. 
However, it has caught the imagination of many.  But what is a real word anyway ?  
Does reverse engineering an etymology make it more real ? 

Didn't the early writers create words to their liking and haven't some of them become part of our shared vocabulary ? 
Will this become an approved word if 
5,000 people use it, more than twice a week ?

 

Or, are we to restrain from creating more symbols for ideas that can be explained and elaborated in prose ?

 Or is it meaningless to call a ' word ' poetic ?

sonder, n. the realization that each random passerby is living a life as vivid and complex as your own