In this paper we study a Hamiltonian system with a spatially asymmetri
c potential. We are interested in the effects on the dynamics when the
potential becomes symmetric slowly in time. We focus on a highly simp
lified nontrivial model problem (a metaphor) to be able to pursue expl
icit calculations as far as possible. Using the techniques of averagin
g and adiabatic invariants, we are able to study all bounded solutions
, which reveals significant asymmetric dynamics even when the asymmetr
ic contributions to the potential have become negligibly small.