That sounds fascinating and intriguing. And it adds color to your exoself idea with a very concrete example. A physical extension of a person that made their house an extension of their body or mind.

I was thinking more of a metaphysical extension of one's being captured in art or writing where a person's physical being, which inevitably withers, is replaced by a metaphysical embodiment of their mind which if done well has the potential for immortality. When one thinks of Socrates for example, although he did not write a single word, Plato captured his dialogues in a timeless manner where we have a very good sense of who he was shaped by Plato's writings that survive.

There are more abstract examples, such as Euclid, who gave us Elements, which laid the foundation for mathematics. His writing tells no story with no characters, but the progression of his theorems are so elegantly structured that we get a sense of the greatness of his mind - or exoself.

And of course, Satoshi gave us Bitcoin which has every possibility of surviving for centuries and positioning his exoself among the very greats in history.