Thank you so much David.
Maybe you remember the story began more than 20 years ago when I was still in Russia and had read some your works on Geometric Algebra. I wrote then a small book on the subject and sent you a copy. You kindly answered confessing that Russian language was a bit problem for you.
This essay is just the beginning. I am working on some further interesting ideas. You are absolutely right about importance of Hopf fibration. All will be about even geometric subalgebras, their fibrations to complex number systems, tangent bundles, connections, etc.
Thank you again.
Alex.