  We consider a simple cosmological model consisting of an empty Bianchi I
Universe, whose Hamiltonian we deparametrise to provide a natural clock
variable. The model thus effectively describes an isotropic universe with an
induced clock given by the shear. Quantising this model, we obtain various
different possible bouncing trajectories (semiquantum expectation values on
coherent states or obtained by the de Broglie-Bohm formulation) and explicit
their clock dependence, specifically emphasising the question of symmetry
across the bounce.
