@roydanroy I'm reading Jürgen Richter-Gebert's, _Perspectives on Projective Geometry: A Guided Tour Through Real and Complex Geometry_,
Projective Geometry is used a lot in computer vision, but I'm aware now it is used in an ad hoc manner -- when it is convenient, we switch to homogenous coordinates from projective geometry, and when not convenient, we stick with Euclidean geometry. This book is so neat, more mathy than I am used to, introduces lots of things new to me in an easy-ish to understand way. I have a thread from the bird site!
I would like to be reading some literary fiction too, currently I don't have anything going. My last few reads concerned dystopian futures, and I need something different.