Kabbalist Reveals The Golden Ratio SecretThe seminal Kabbalistic work Shefa Tal, by R. Shabatai Sheftal Horowitz of Prague (c. 1561-1619) writes:"See how the straight line curves into a descending gradient (like a waterfall), narrowing, and ultimately ripening into a point in-itself."
Image from the book Shefa Tal, suggesting connection of the hand to that act of creation and relevance to letters/numbers.