I became very obsessed with hyperbolic geometry and from there, projective geometry, and finally complex projective geometry (& Cayley Klein geometry).<p>I've bought dozens of books on the subject, but one in particular has been working for me: "Perspectives on Projective Geometry: A Guided Tour Through Real and Complex Geometry"
by Jürgen Richter-Gebert. In my opinion, it's an exceptionally clear book and it should be accessible to anyone with a basic understanding of high school trigonometry and high school algebra, and basic linear algebra (no calculus seems to be required). It would also be helpful to know what a complex number is and why they are useful.<p>I'm trying to read it cover to cover, and I was wondering if anyone would be interested in reading it along with me and doing a weekly video call to discuss.<p>pdf: https://www-m10.ma.tum.de/foswiki/pub/Lehre/WS0910/ProjektiveGeometrieWS0910/GeomBook.pdf<p>Hard copy: https://www.amazon.com/gp/product/B00DGERAQY/<p>If you're interested, please maybe add a comment saying what interests you about this subject. My email address is in my profile as well.