  A simple procedure for obtaining superpositions of macroscopically distinct
states is proposed and analyzed. We find that a thermal equilibrium state can
be converted into such a state when a single global measurement of a
macroscopic observable, such as the total magnetization, is made. This method
is valid for systems with macroscopic degrees of freedom and finite (including
zero) temperature. The superposition state is obtained with a high (low)
probability when the measurement is made with a high (low) resolution. We find
that this method is feasible in an experiment.
