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I am not aware of that book, no (if it is a book). Solipsism has several interpretations, I think more in terms of oneness, whereby everything that exists is part of 'the one' - some have attempted to define that understanding as solipsism, however, it depends where you draw the line around the idea of 'self'. What questions do you have? :)

You should perhaps try it, I haven't even managed 20% yet, and I'm five+ months into contemplating the received information...

We'll get to The question in due time. 🙏

ETHICA Ordine Geometrico Demonstrata (wiki-link through goo.gl due to markdown limitation)

whereby everything that exists is part of 'the one' - snip -

Q: How many 'the one' does one have "access" to?

🙏 1ove 💞