  The article explores a new formalism for describing motion in quantum
mechanics. The construction is based on generalized coherent states with
evolving fiducial vector. Weyl-Heisenberg coherent states are utilised to split
quantum systems into `classical' and `quantum' degrees of freedom. The
decomposition is found to be equivalent to quantum mechanics perceived from a
semi-classical frame. The split allows for introduction of a new definition of
classical state and is a convenient starting point for approximate analysis of
quantum dynamics. An example of a meta-stable state is given as a practical
illustration of the introduced concepts.
