This is great. Thx for sharing.
I like your informative page. And the reference list is good, in particular
the first reference: Ethan D. Bolker, “The Spinor Spanner”. Am. Math. Mon.
80, 977 (Nov. 1973)
I was CS student at UMass Boston early '80s and Ethan Bolker was an
influential teacher there, very popular with the CS students.