3 added 97 characters in body

The first interesting theorem in Non Euclidian Geometry is...

This isn´t a proof, but...

Paper but it´s the object of the study fisically represented: paper model of hyperbolic plane (by Bill Thurston). I´m lovin it!

And ...and of course, the models of Klein and of Poincaré of hyperbolic plane (My favorite is the half plane: nice!)

2 added 240 characters in body

This isn´t a proof, but...

Paper model of hyperbolic plane (by Bill Thurston)

I´m lovin it!

And of course, the models of Klein and of Poincaré of hyperbolic plane

(My favorite is the half plane: nice!)