 Against Hegel, Deleuze asserts that while dialectic is structured by negation and opposition within a posited identity, “difference is the only principle of genesis or production” (Deleuze 1983 [1962], 157). Opposition occurs on the same logical plane, but difference moves across planes and levels, and not only in one direction. Furthermore, where Hegel takes the work of the negative to be dialectic's driving power, Deleuze declares that difference is thinkable only as repetition repeating itself (as in Nietzsche's eternal return), where difference affirms itself in eternally differing  from itself. Its movement is productive, but without logical opposition, negation, or necessity. Instead, chance and multiplicity are repeated, just as a dice-throw repeats the randomness of the throw along with every number. On the other hand, dialectic cancels out chance and affirms the movement of the negative as a working out of identity, as in the Science of Logic where being in its immediacy is posited as equal only to itself (Hegel 1812, 82). For Deleuze, however, sensibility introduces an aleatory moment into thought's development, making accidentality and contingency conditions for thinking. These conditions upset logical identity and opposition, and place the limit of thinking beyond any dialectical system.