  The predictions of event anisotropy parameters from transport model RQMD are
compared with the recent experimental measurements for 158$A$ GeV Pb+Pb
collisions. Using the same model, we study the time evolution of event
anisotropy at 2$A$ GeV and 158$A$ GeV for several colliding systems. For the
first time, both momentum and configuration space information are studied using
the Fourier analysis of the azimuthal angular distribution. We find that, in
the model, the initial geometry of the collision plays a dominant role in
determining the anisotropy parameters.
