In addition to this, there is the book, <i>Projective Geometric Algebra</i>: http://projectivegeometricalgebra.org/ http://projectivegeometricalgebra.org/ and

In addition to this, there is the book, <i>Projective Geometric Algebra</i>: http://projectivegeometricalgebra.org/ http://projectivegeometricalgebra.org/ and for a more grounded approach, the book series from Make: - Geometry: https://www.goodreads.com/book/show/58059196-make https://www.goodreads.com/book/show/58059196-make - Trigonometry: https://www.goodreads.com/book/show/123127774-make https://www.goodreads.com/book/show/123127774-make - Calculus: https://www.goodreads.com/book/show/61739368-make https://www.goodreads.com/book/show/61739368-make