Cat Bordhi is right up there along with EZ in her understanding of geometry and 3D architecture! Her new book, New Pathways for Sock Knitters is an amazing bend of the mind in sock knitting! She has stuff for toe up knitters, cuff down knitters, two on two knitters, Magic Loop or double points. Customizing is there, too.
I decided to do her learning socks as baby socks for a set of twins coming to a couple with whom I work.... here is the first pair, depicting the center top of the foot increases instead of a traditional gusset. Next up, the spiral increase version.