“Ships from the stars!” Dick ejaculated.
With the substitution of waves of probability for concrete particles, the world lines of objects are no longer the fixed and simple paths they once were. Geodesics have an infinite proliferation of possible branches, at the whim of sub-atomic indeterminism.
Still, of course, in large masses the statistical results of the new physics are not much different from those given by the classical laws. But there is a fundamental difference. The apparent reality of the universe is the same—but it rests upon a quicksand of possible change.