In the quantum world we don't have specific trajectories, the particle so to speak goes through all possible paths. In the classical and macroscopic world we have definite paths, and usually one specific trajectory is assigned to a body's motion.
How would you go from a trajectoryless world to trajectoried world?
Are there any theories about this bridge between the two worlds?
I guess there should be such a theory, cause one world is the building block of the other.