|A diagram of I Ching hexagrams owned by German mathematician and philosopher Gottfried Wilhelm Leibniz. It was sent to Leibniz from the French Jesuit Joachim Bouvet. The Arabic numerals written on the diagram were added by Leibniz. The grid in the center presents the hexagrams in Fuxi or binary sequence, reading across and down. The same order is used on the outside, reading up from the bottom around on the right, then up again on the left to the top.
Leibniz Archive, Niedersächsische Landesbibliothek