Intuitive Geometry

A brief introduction to classical, projective, and non-Euclidean geometry, including historical and cultural aspects. Lots of visualisation and hands-on activities.

Visual Euclid

Real Euclid, illustrated. Focus on geometry instead of decoding ABCD cryptograms. This selection covers the core of Book I of Euclid’s Elements. The text is Euclid’s own, but I have added step-by-step figures for each stage of the arguments.