After reading the introduction, I jumped to the four appendices where the equation

e^(pi)i = -1

15 ways of looking at a blackbird. I see a half-turn around the unit circle on the complex plane, with 1+0j as the starting point. That is, we a pointing to a point (-1,0) on the complex plane, by way of its polar coordinates. e is a numerical value - the numerical value that makes this so. Not fully satisfactory, by any means, but is a step toward a geometric approach. PyGeo's new version has does alot with the exploration of the geometry of complex numbers. Art Art