The wheels are detached from the cart; husband and wife look away from each other. When strength acts on its own and one is self-centered and inconsiderate of others, this turns away from harmony and loses balance, sure to end in ruination of strength.
Liu I-ming treats the detached cart-wheels as a primary symbol for the psychological and relational ruin that follows from self-centered action and the loss of harmony between firmness and flexibility.
, The Taoist I Ching, 1986thesis