by galen

In this paper I propose a novel view on the persistence of identity through time. I propose that an object is defined by a certain set of basic properties, that these properties are maintained throughout the life span of the whole, and that the whole does not cease to exist due to the replacement of individual parts. Given the constant change throughout the persistence of a single whole, I call this idea of identity “Fluid Identity.”

Fascinating stuff. Don't remember where I originally found this; maybe the philosophy subreddit? All I know for sure is that it's one of the first philosophy papers I ever read, and it remains the basis for most of my thoughts and beliefs on identity. Give it a read, if you're inclined.