[Idia tapped his fingers lightly against the glass as he held it, silent as Romeo answered, and for several long moments afterwards... before speaking softly.] There's an old thought experiment, called the Ship of Theseus. If you have a ship and over time you slowly start replacing the pieces as they need it, until all the pieces have been replaced, is it the same ship, and if not, when did it stop being the ship of Theseus?

In a way people, well, humans... donno about... gods and others, [Since those were an option considering who was on the train.] Are also like that. Our cells replace themselves once they get too old and die, even our brain cells which hold our memories and personality. So it's the same, are we still ourselves despite slowly being replaced piece by piece? [It's... not quite as heavy as Idia can get, but he feels its a good start point to consider this all from. Just what makes a person? Was it even a physical thing? If they were just a floating conscious would they still be a person, or something else? Or did the physical body not matter at all?]