 Łukasiewicz proudly declares “that three-valued logic has, above all, theoretical significance as the first attempt to create a non-Aristotelian logic” (PL, 18; SW, 88). What its practical significance is, he thinks awaits to be seen, and for this we need “to compare with experience the consequences of the indeterministic view which is the metaphysical basis of the new logic” (ibid.).