20.     Duchamp also explains in this note that "the serial characteristic of the readymade" is like an event ("speech") "delivered" or returned on various "occasions" at various "hours." Duchamp, by analogy, illustrates Poincaré's notion of the co-existence of stability and randomness or "indeterminate determination" in his probabilistic system. Initial conditions effect events, so that we know they will occur but we cannot say exactly where ("occasions") or when.