The tenth hexagram, Lu ("Treading" or Conduct), places Qian (Heaven) above Dui (Lake). The joyous lake beneath the strong heaven gives the classic image of treading carefully, even upon the tail of a tiger. It follows The Taming Power of the Small in the King Wen sequence.
In the xiantian, or Earlier Heaven, arrangement, the binary order devised by Shao Yong in the eleventh century and traditionally ascribed to Fu Xi, Lu stands ninth of 64, distinct from its tenth position in the King Wen sequence traced above; this was the arrangement the Jesuit Joachim Bouvet sent from Beijing in 1701 to Gottfried Wilhelm Leibniz, who read its broken and unbroken lines as his own binary 0 and 1.
Read from the bottom, the six lines of Treading run yang, yang, yin, yang, yang, yang. A later interpretive layer absent from the original Zhou Yi, the nuclear hexagram (hu gua), treats lines two through four as a lower trigram and lines three through five as an upper one; here they combine as Xun over Li, forming hexagram 37, The Family (Jia Ren), a hidden figure first associated with the Han-dynasty scholar Jing Fang, whose Yijing commentary of the first century BCE is credited with the earliest appearance of nuclear trigrams. Treading's King Wen partner is hexagram 9, Small Taming (Xiao Xu); most of the sixty-four pair this way, related by turning the whole figure upside down, while the eight hexagrams built from a single doubled trigram pair instead by inverting every line. Mawangdui (1973) orders hexagrams by trigram, not King Wen; names here follow Wilhelm and Baynes, 1950, not Legge, 1882.